Malicious PDF — malware analysis report

Static analysis result for SHA-256 725e1c58b1563fce…

MALICIOUS

PDF

69.6 KB Created: 2021-10-04 03:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9d82e618088d72e0884a85dc26c87d09 SHA-1: ccdb2e88838e986e69e3a0eae77492f96b6dae6d SHA-256: 725e1c58b1563fcee598fb0c3502ef0bce086a3cfb9406500c6c9f0297e6e2b5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised websites, suggesting it functions as a link farm or redirection mechanism. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports that the PDF is designed to lead users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://smidgel.ru/uplcv?utm_term=thalassemia+is+also+called PDF link annotation
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16146988ba1068---18962855025.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/66288340237.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee22c96976---mikikizamazabi.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/migeditunekamafisonasawu.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/pasedozebemulunimizubuwop.pdfIn PDF document text
    • https://europartner2.pl/uploads/88447152164.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/vawavu.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/fasixogamabewibafusegi.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/mikeno.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/55796247300.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/b8746ce6924a9d73d0d53a42e91a5b1d/mapovaf.pdfIn PDF document text
    • http://mega-stainlesssteel.com/uploads/image/files/98202242070.pdfIn PDF document text
    • https://amityhr.com/userfiles/file/loxemodizove.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/90703291720.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/2729867256.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f46e576c0---60496484493.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/2021916152486962.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/d94d5b6ed2b6a88c7f1bc232e69f07d1/vepekojozonixoseva.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/0a4e48e99776058ab64387daeb636940/zowerawabugoza.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/80328985884.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16136c44610e94---22263081831.pdfIn PDF document text
    • https://binhvi.com/upload/files/xonekin.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_off0000afbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFBC 10296 bytes
SHA-256: 1c9644d149b74ecb3c2b9b8bd3a1da26b78ce600f09f67c89d96b41b52d2cf64
font_01_sfnt_off0000c6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000defb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFB 16276 bytes
SHA-256: cedc5bff4f2bb96ebef6625dba43c6f1589c83c5f9a828e8cdde165c8b1f7b1f

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