Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf42675125e6cabc…

MALICIOUS

PDF

82.4 KB Created: 2021-08-16 18:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: a4b1e2e24f24860a916ac462daecd825 SHA-1: 49fa45c14a7e70494d85f343deccda7afb1bc6cf SHA-256: bf42675125e6cabc5ed1b4bcd7030e8827997a9f8a618cc8695041008e484a4c
156 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 upload directories, indicating a link farm or SEO manipulation tactic. ClamAV detected this file as Pdf.Phishing.Trojan, and an ML classifier also flagged it as malicious. The presence of multiple external URIs and link farms suggests an attempt to direct users to potentially malicious or compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • 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://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/5eef39187b12b1b08ad7b7ba217531ae/beralivif.pdf In PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/vasinalefafun.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/kezoxagofegilu.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/39249608333.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/wafiri.pdfIn PDF document text
    • https://windsbs.biz/files/file/nivabo.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/povomib.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083390084ddb---linadabuw.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf425a8a8f---92466996081.pdfIn PDF document text
    • http://espokebar.com/uploads/files/mujutidujafojefe.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdf659ccba---worotubixuvip.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/58921214209.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/gininilokagemomirexagur.pdfIn PDF document text
    • http://dkyangmei.com/uploadfile/file/2021072808594573499.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f03ca2048a4---78335824054.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/pum04g3froe5brqsf1cvhf0i7j/31285928592.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/42506236018.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/bifidafutaxejomedefepevo.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/1d1ddde4dcafaa2d1efdc9a4f9e3e200/75920276268.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/shmhgscn5qariu7kfshf643afo/babesiduxanitobekiradob.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210721231821.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c82a523580---pesevudilamazujarugisaser.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/27000686659.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/ffbb0782af4b3726cff2dedfbbd1785c/javirokuditikuwuvuwugoxep.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/7116075770.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/61072744806.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=ielts+vocabulary-+learn+300+essential+words+for+ielts+pdfPDF 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_off0000db90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB90 16508 bytes
SHA-256: 908e6539a43c3a9ba6a8ce2783474d228749d1a8920ee2917337a9e281052fd9
font_01_sfnt_off00010677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10677 11400 bytes
SHA-256: cf6cdcca12e0618f8480eed25ab0cd523d5bf2055217ce1a4d30980ea88eed58
font_02_sfnt_off00012177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12177 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1