Malicious PDF — malware analysis report

Static analysis result for SHA-256 280b95f03415d6cb…

MALICIOUS

PDF

116.7 KB Created: 2021-09-01 15:06:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: fb48668bfdfb166e3500f80d3466180a SHA-1: 41c5de88183247c04e7da8ae575fe7272dbcc3ce SHA-256: 280b95f03415d6cbbe748ee9accd2d221e3d8c9ace467665321b294046992f28
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/om08fj8j67nul63mcpod8978ta/vijorokas.pdf In PDF document text
    • https://atlastoursntravels.com/userfiles/file/bugiritotemolomuroba.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/vuriwafurowafimemefarike.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e9d0e9b7f---24066548638.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c68828c0e1b---tinokuwuzixagozeb.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e9161a8c090---6683502666.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210620052223.pdfIn PDF document text
    • https://pendekaremas.com/contents//files/90640170579.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/ruxolesokukesodev.pdfIn PDF document text
    • http://nutricion-intravenosa.com/wp-content/plugins/super-forms/uploads/php/files/044a01fd22da9369bd993fe37c5bec55/lesonulevejizevekibe.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160c42df507bc6---29684660970.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/9un73d2nd0f420f34piqltjimk/32734630311.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e9c5122031---fivikovofo.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/89926313567.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/51920079813.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/74706bb23c4856b8fb4107f653f00af9/60521794543.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090ea1f920fc---40739083529.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/f5ea97f86bc227d0bcefe886c9a83fe8/nawotumavulegomejus.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c1142cab09a---61266610670.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/51021142355.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/0827d91ac0511df0e787553880507e58/kajixutozedited.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/juwovejor.pdfIn PDF document text
    • http://becskeicsodajo.hu/admin/fck_upload/file/kisubimamizevipun.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1e778dfec---kawobosuvufibo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=psychodynamic+theory+in+criminologyPDF 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_off00016316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16316 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017b28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B28 18712 bytes
SHA-256: 26bedcbf364ddbc708f74cbf740c3f8634a77c6e09053c59bac75c6f62e8a477
font_02_sfnt_off0001ab74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB74 10932 bytes
SHA-256: a1e0c4d4713e44169104b31a68551c63c48e1b79af88b309d264e821eaeff354

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