Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf762b03fbd71729…

MALICIOUS

PDF

80.4 KB Created: 2021-09-04 07:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 13c81a0b122f07ec072fe74e097480aa SHA-1: dc2605024e512ca7412aa1ce41152ef15dd5e227 SHA-256: bf762b03fbd71729877fb2d0ae3031ec2983d3bf1ffe703ad0251f5fad891d3c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to compromised websites. These sites likely host further malicious content or facilitate exploitation, aligning with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16080f513b06b0---34979302285.pdf In PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/e57f22021311274698316dfabc54d848/gefitonemakuvedor.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/lanajimumoj.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/e202092f30d2de9a3effb278dc7de780/58547212297.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/37357459504.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/79eea4853353e305dfbd999235c36300/76677107127.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/24175349303.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a4db99e4aa9---satabuwepiwipovu.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/kerexip.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/32259127514.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/166b8154edbdf686840136e3d1493242/8931431459.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c164b914aa3---wotigexevoposebadunimiv.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16127cd458e685---18226870870.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/velalalasulujav.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/87702641916.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/27026326599.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fe71458a4cd---9828555552.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/5a312ac0ce1616f09c1fe22b43b7e6b9/towizikorenavadi.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/f304d1f2470d1fdd6df9c50e85c74950/fovetalemut.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a79c79ea765---13861758202.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/20867273085.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/66682988376.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/94659796557.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=speech+de+soutenance+bts+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_off0000d576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD576 10796 bytes
SHA-256: 8e108cc2f68e2e62310df471a55fcedc38f3d44bda643db48f6f0f68953e11c2
font_01_sfnt_off0000ee15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10627 17652 bytes
SHA-256: 2aed450bcd619088a4443cad5f313cbd379605b41282874d92d4420c7e10928a