Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcd034c9bd2b6cb8…

MALICIOUS

PDF

89.5 KB Created: 2021-06-26 20:35:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b25b64d2f44def83e581e84b4ec2f806 SHA-1: ca04ef96bd35791f2c282ad4b59367c66e66afca SHA-256: fcd034c9bd2b6cb8f464e77f3977aeae9206e98b5d8213149cf649c163e9ec7d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to compromised WordPress sites, many of which host further PDF files. This suggests a link farm designed to distribute malware, likely through a phishing or social engineering lure. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports this malicious intent. No scripts were extracted, but the structure and URL patterns are indicative of a malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/nvhg5btgqlch73d0lna0qeu2d1/34683306878.pdf In PDF document text
    • http://asesorgubernamental.com/images/file/63870493183.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/jopopimidemuvinos.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/684cab74dfd275a4daa7a5ca4ab0a1b0/lifulijatev.pdfIn PDF document text
    • https://service-panev.com/userfiles/ludusalilu.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6992ee1e05---5225162258.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb739abbfe---9436790887.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/0ol3gu3gftr2k65htiuvdolkko/1080461741.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/cet5j36n4ja98tf73aimbdf62v/xixazuwuderove.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b40b927f848---23990957683.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/42519b84f37677b0e08ee2d07f4289ed/kurigoluwojaza.pdfIn PDF document text
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/xomalobusu.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079f5cfada73---telejavolozegopodumu.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c59723b6df9---wuxuzorikofesibavilepewa.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/u301kp617ejanvcmhp3grs21a3/82661819968.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/b9afcbf060d7d44c1b312ac3551cbb61/vedowonubajovow.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/7uka57af5tp88qf3asmbi2td35/pugaja.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/6835cb45d0b13d4bb4ee57b7e252b4fb/zasurimuvosupanikek.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606efd8d67eda---kevemepotipuvigafalali.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d28eec7b3a---sunexukowezazubezalo.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4bd113348---dinosegusisu.pdfIn PDF document text
    • http://westleyden72reunion.com/clients/4/46/469dc9162705cbff2d1fbe132f144f37/File/33029185189.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/90fb625a64080da92c26456d42d65544/jurobopebudadezekopabuwov.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160819d7556cb5---mogaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=microelectronic+circuits+7th+solutionPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF548 10308 bytes
SHA-256: de37c45a8545ba700b10bba9fe0bb3b010cb25b09f7642b71abeac4a668cb913
font_01_sfnt_off00010c85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12497 20260 bytes
SHA-256: bfbbd5716fded27ddfc66ff7268c405fab4928d407cacbcbee4c3b33c96a0de3

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