Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dfc13117a82ef35…

MALICIOUS

PDF

83.8 KB Created: 2021-09-12 23:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 2e020c18929bce55938aac4bf22de938 SHA-1: aa4777aa3c8ac80c0e91bc41b6bc4a584f289389 SHA-256: 8dfc13117a82ef355ccbe61897c1be64fd1fbeeb22efeb7672ff46c1a1ce1e49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/5ce7dab06a1e653bef28311626c0a08b/sipadilegul.pdf In PDF document text
    • http://tjjjsh.com/uploads/files/86263305663.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/rakalu.pdfIn PDF document text
    • http://splogservice.ru/content/file/bovuva.pdfIn PDF document text
    • http://s2group.pl/userfiles/file/71147949867.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/58009464316.pdfIn PDF document text
    • http://puebloexec.com/userfiles/file/93322283183.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/65818089851.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/vawaxuniwi.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/59007749136.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/wisitewiki.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/wumasemibixitide.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/ee532cf01ed1deee48ad840308f3b6b4/40119941980.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/6f665ec973f40c379b02752c001b3090/23550116496.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/jajenazifaruj.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/sabamoxumosufakalegob.pdfIn PDF document text
    • http://rc-saty.cz/gais/image/file/gerumuwixawer.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98982986817.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/10789719487.pdfIn PDF document text
    • http://lysfyyy.com/upload/files/gugimewejug.pdfIn PDF document text
    • https://okazionche.com/files/nizonisuzo.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16137bf4f146b5---2641772004.pdfIn PDF document text
    • https://fix2go.info/userfiles/file/17133447688.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/af94c05a86123a920da1dafb1cf5db2b/fadufawa.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/31720315862.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=morris+mano+digital+design+3rd+edition+solutions+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_off0000e0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FD 17472 bytes
SHA-256: 38f47f4131fa447fde8a5fca5d3cb3be69d57311427241ed1eb4db873950fbda
font_01_sfnt_off00010edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDD 11104 bytes
SHA-256: 0b57574d16659b4a8d838fa4cfbccc4d6f313533363ac53a7ca4b5af913f962b
font_02_sfnt_off00012898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12898 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1