Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c6657beed9edcd…

MALICIOUS

PDF

83.8 KB Created: 2021-09-16 21:33:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7a99dc222ca2448a9197d99838704f11 SHA-1: 41ca3a96bd675eedd0d182bba1403a0408a927c2 SHA-256: 90c6657beed9edcd996afa7311741aaff2ef5c846217fee879ecfbf33ebf5b32
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged as malicious by ML classifiers and ClamAV, and contains a link farm pointing to potentially compromised WordPress upload storage. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, a common tactic in phishing and tech-support scams. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to deliver a malicious payload or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://preprodpcb.com/userfiles/files/keredomezavekigiv.pdf In PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/988123aa3e9a36fea5b75a5d79c84ef7/givegatiranoju.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/2821621379.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/fitowowipibafakot.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/338ef56a41ec62044ff58feb74b828e1/begamekafamiseli.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/75632012419.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/sotozewedopos.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/sedotidorosisugugelax.pdfIn PDF document text
    • http://emachn.com/data/attachment/file/jokajopezetajono.pdfIn PDF document text
    • https://tsegypt.com/file/27156011512.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/42209337579.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/f415a37fbaee59d0e61a43e7a0dbd96e/buvek.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/49485974665.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16136961964bcd---vijupuboxewemig.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/55882255629.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/furevizanodenaserozox.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f7218cfe1---dizewam.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/paparaxawidadunena.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/zifofapufirobogob.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/45878694703.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/tolexabopimafide.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/bofebuzep.pdfIn PDF document text
    • https://fpcofmacon.com/nbloom/fckuploads/file/patesiwexajibiwopifa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=on+screen+volume+control+androidPDF 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_off0000dc69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF480 10720 bytes
SHA-256: 1e27839d2009a7abc361f9a2a6ef9a21f83f38526c7894489ed07a71fdf06816
font_02_sfnt_off00010d26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D26 20152 bytes
SHA-256: 6ad7c40333140b4e3cb6110ac6993e5c2daff196e1f8022541bd533e4e47666b

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