Malicious PDF — malware analysis report

Static analysis result for SHA-256 928cb816f177c6e8…

MALICIOUS

PDF

74.0 KB Created: 2021-09-19 09:04:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 57225694878ff79debe1eef24cf8e426 SHA-1: 1d21d51fdaa7fbecce7a22d5700b6242d755b349 SHA-256: 928cb816f177c6e844e75f90fd5baca90b00c8ce2bd2d52cf5bf8934d732909a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a callback phishing scam by prompting the user to call a phone number. The document contains numerous external URIs and link farm patterns, suggesting an attempt to redirect users to malicious sites. No scripts were extracted, but the PDF structure and embedded URLs indicate a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://garglob.ru/uplcv?utm_term=studio+a1+deutsch+pdf PDF link annotation
    • http://studioaba.net/userfiles/files/17233583794.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/2628637074.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/13871619296.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/mibuwe.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/mawur.pdfIn PDF document text
    • http://erago.cidees.com/uploads/files/23547948400.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/fomotawasodivesofesiwugaw.pdfIn PDF document text
    • http://www.siposferenc.hu/html/wokalufajubiwoxub.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/66714673119.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/wewawusoziwiw.pdfIn PDF document text
    • http://opgzvh.hr/upload/file/mazezilofowodumobage.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/96599136207.pdfIn PDF document text
    • http://iwayman.com/uploadfiles/file/210912123145390830xazk2f.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16141adef1515f---foxumowuxu.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/fekusanefoguburaramowa.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/39029198276.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd57a013e1---46925616031.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/98761723498.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/53259034118.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/c65ed3b69e8f7dd1d868b9ad30e802c8/ravifonu.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/5d5182db0f4312e77069e3c8632d9e00/82651101736.pdfIn PDF document text
    • http://isvpro.com/custom/files/medifigixedetapojado.pdfIn PDF document text
    • https://arerp.kr/data/file///dawaxuduxezojigawabap.pdfIn PDF document text
    • 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_off0000b674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB674 10696 bytes
SHA-256: 834a3cef9081574c06878d0c685484aa290349843c3567803d49b1871d88b1de
font_01_sfnt_off0000cf2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2B 20060 bytes
SHA-256: 203cd9eb20dd0a6d0b2dc844113f04fed193b0ae9d6b15e0279feec04aac81af
font_02_sfnt_off000102bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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