Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7b05a41a579db8b…

MALICIOUS

PDF

98.6 KB Created: 2021-09-08 19:06:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 20d41dadcb57b8d38c6ae0ac99a04dc6 SHA-1: acd554d3e6d8640fd2fb9d1d9ace9ad3183412e3 SHA-256: f7b05a41a579db8bc6cd77c7c80faca91f623e2b79566f96af7f439d6a7313fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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 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://hinaweb.com/upload/file/kaduvedutibataniguj.pdf In PDF document text
    • https://cingenito.ca/upload/editor/file/zotose.pdfIn PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/48147575128.pdfIn PDF document text
    • https://maxtarget.by/ckfinder/userfiles/files/94715029547.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/81386559128.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/gbd147274s6md3lg29ne9ap1jq/wovab.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/dakulafitasorimevozu.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/surofofunazowusaberame.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/68220354142.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/jidixudijofanupusogolope.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/sovezidosenot.pdfIn PDF document text
    • http://apvn.info/userfiles/file/zafizipakaf.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/74728089539.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f11cd364cc---bimotosu.pdfIn PDF document text
    • http://vattuxaydunghl.com/userfiles/file/vanagigoluwebosugiruxol.pdfIn PDF document text
    • https://digireg.es/upload/56647917895.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/2078181135.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/88416787750.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/77742617489.pdfIn PDF document text
    • https://triosms.com/userfiles/file/79084126917.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/id31206ej7pmeoso2rgkb5l533/44125292703.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210907123003.pdfIn PDF document text
    • http://halanmilk.com/upload/files/kerotelegivuwunomoxifu.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/9386798824.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210906130105.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=different+cultures+in+south+africa+pdfPDF 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_off000117be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BE 19932 bytes
SHA-256: d7b6c2f893d9d5738a8a858b5aa39380fe4f48bec487023fc621c10d49316185
font_01_sfnt_off00014b98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B98 10820 bytes
SHA-256: b4e830b2d80355c4f93805a70135b298479f0db0b5a590ae09039fa0229324a5
font_02_sfnt_off0001647d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1647D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1