Malicious PDF — malware analysis report

Static analysis result for SHA-256 83447077737fcc1e…

MALICIOUS

PDF

86.0 KB Created: 2021-08-01 18:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9a36adc63dd27bbe024b95a3212e41fd SHA-1: 8ae019b110b6d9a234fcd3b7553c727080e417d2 SHA-256: 83447077737fcc1eb4aa7ed8274d06ec7c1230bfe89a09b5a0b6ff8c39cdbf25
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. The heuristic 'SE_CALLBACK_LURE' indicates the document likely contains a phone number intended to trick the user into calling for support or to resolve a fake issue. Numerous URLs were extracted, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • 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://atonoserver.com/userfiles/file/58888767412.pdf In PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/rowafotazasoxilaguz.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/55019489209.pdfIn PDF document text
    • http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/vewutedovufud.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/dduh2a5fiqqijlc85f9jqsdn8c/40775391585.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//63615864764.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/kogesulotupogeku.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/figutavamofuvorage.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/gs3crfkb0vf1untfqkipg2vh5c/3713132408.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/82494402311.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/77439356589.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab06cc876c---51136549578.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/64573867234.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/tpfashsftf4s2a4mpuf1s26gtc/panifenusodumekogujon.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/dovivaririr.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/faa5e935e1a54a79b954b74354f20201/21472766546.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/sipagifowo.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f740fd3074---pukojijuloxusadorawenobav.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/gixonoradawubituwopames.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/muvetiwu.pdfIn PDF document text
    • http://shihtzufurbabies.net/clients/d/d3/d383cf0c90cf2d2391705d5438694b4c/File/84307561183.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/63325127847.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160878ed27b0f7---59772122315.pdfIn PDF document text
    • https://www.oapublishinglondon.com/ckfinder/userfiles/files/80277830856.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+do+i+pair+my+jlab+bluetooth+earbudsPDF 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_off0000e8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DC 17800 bytes
SHA-256: f1821cd6f8e9bafccba1a660a3c014dcc1bbd524cb04998dcf386b80f16dc6bf
font_01_sfnt_off000117ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AB 11116 bytes
SHA-256: b10b80cd09ad5804263c04a26b0e562619894569cc962385e32295115ab88629
font_02_sfnt_off0001315b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1315B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1