Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb98b8fe7098c1c9…

MALICIOUS

PDF

76.8 KB Created: 2021-09-06 20:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ba23da8518fcf2c0183159f497f004df SHA-1: b5a1f3278a770199e40d4fed27a21b8666d27aa8 SHA-256: fb98b8fe7098c1c95837de9b75545f18b3ef6e7de9e777ac01a70ce6a893dab5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the PDF structure and link farm heuristics point towards an attempt to exploit users via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 http://bigcool.net/webroot/img/files/28185895036.pdf In PDF document text
    • https://franchiseharbor.com/files/files/gokexuresit.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/a3915befac023ed5f32dcf32f75c16ca/90472329082.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdda2dee97---retarurozozubezurujamabat.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160b74f24c575e---86752162307.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4bcd1c72b---doralolupebuso.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/51321774636.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/6deef577ef73236775c5158ff924fb45/sojaba.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609915283b748---56489016974.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/58528550685.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/pesuzedaginoxit.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/58920225492.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/fcdeadb159b5369fac2952ed9636a543/95786785360.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/jikumufuwebubawiwazol.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/b4afca2b0518a630f32fae68233a5cae/18821925998.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/sewuba.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/zukigegaxagalixebudi.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/42208301259.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/tl8m58a7mgvcj8a70vghlfptb4/3029656824.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/44835740987.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/14171789139.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/puvonidewaga.pdfIn PDF document text
    • https://usis-consulting.us/uploads/files/dexavomuwutugep.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/3lfmu1ncjmt906re941o12rpj7/lelidunetetasega.pdfIn PDF document text
    • http://bscartridge.com/pic/xosizixagijebolatubejelu.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/169bc472c7cf08aba9fd584a1099a900/zigewak.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/5386f0f97b82fd1901d2739891b4ab79/18545738613.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=2012+jeep+patriot+manual+transmission+removalPDF 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_off0000c73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC73D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF54 10904 bytes
SHA-256: b3abe6721afee4391e9f4c2adc9381c482174cb55af498b31f8d98d9fe12ea2c
font_02_sfnt_off0000f89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89A 17556 bytes
SHA-256: 2084dc85cbb70b8362347cf60f1baaa596bba4273c1df6bd9a1c19bf7c8f8fe3

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