Malicious PDF — malware analysis report

Static analysis result for SHA-256 c65ba473530d422f…

MALICIOUS

PDF

82.3 KB Created: 2021-09-18 19:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3af177a35166f0b5e31d53fabb8fec21 SHA-1: f9cf1f56ff4dc89037c0c09c28842f19dd18cd4d SHA-256: c65ba473530d422f92812931428168ce9783757a716691ebd55722b0840f2047
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by multiple heuristics and an ML classifier. It contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of urgency language further supports a phishing or scam attempt. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely leading to a phishing page or a download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://infrive.ru/uplcv?utm_term=breeze+music+apk PDF link annotation
    • http://grandp.ru/userfiles/file/jodadufarusuxijasu.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/0ca1e0996594931da80b55e8feb8adb7/39325081293.pdfIn PDF document text
    • http://sake-tori.com/images/library/File/sinabipizosobaxex.pdfIn PDF document text
    • http://nhac.ditimchanly.org/Images_upload/files/29747209657.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/46078480082.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/aa3714e066151816441009026c9bcc75/jagewigunalorobu.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/sirebos.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/65185508465.pdfIn PDF document text
    • http://apvn.info/userfiles/file/mewubuxinesajiwevamu.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/jutisux.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-5/20210905033213201808.pdfIn PDF document text
    • https://photojet.net/userfiles/file/sinafenokagiferowepavuxim.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/95077440443.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/2307654197.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/76672254985.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/faguweje.pdfIn PDF document text
    • https://777mto.org/contents/files/zefedixawaxavale.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/42340349209.pdfIn PDF document text
    • https://nordiskvillaventilation.dk/userfiles/file/wazolo.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/bemexidosifig.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/9bcb0483942bd9c8ce464f86de1c78b6/witirepizukibozixagu.pdfIn PDF document text
    • http://anm-av.de/uploads/files/46146937802.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gusojiros.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_off0000d9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F0 18980 bytes
SHA-256: 93af71967c853246592fc8924ad3b94792e3c494b7d0dcfdd76b9389935f73e1
font_01_sfnt_off00010b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7D 10472 bytes
SHA-256: c619a2f7102a5f44b5ee49fab9370f2414f8dd32b1c08e822d88f71a9e185fef
font_02_sfnt_off00012369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12369 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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