Malicious PDF — malware analysis report

Static analysis result for SHA-256 45232e30e3480903…

MALICIOUS

PDF

92.8 KB Created: 2021-09-01 23:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8a1d5618722a33dd9b9e158cdf4d55f6 SHA-1: 9e74a6ddc32532f92de8f6c7dd4ab25e71d778a9 SHA-256: 45232e30e348090344fde39cd70fe2497f6284eda33766bc53e44d945077a3a0
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 WordPress sites and disposable hosting, indicative of a link farm designed to distribute malicious content. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The document body is heavily obfuscated and unreadable, but the heuristics and URLs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16117228e040e3---xevabepibajaguvag.pdf In PDF document text
    • http://islandpointfl.com/userimages/dufetu.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/weramaneva.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/gisalegirufus.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/mipak.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/nunomeli.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/74925631083.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/pasivexodipusetixibanu.pdfIn PDF document text
    • http://splogservice.ru/content/file/626268968.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/kuseforumolotanexisuki.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/robisezikuwaxilo.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076067e1ff1b---56793437811.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/wedisedufanijorotisofojuj.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/xizotagepelagagadoxed.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/960f590a96d523931918c8994891704d/53117588414.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a58ef0e6b---74087086061.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/29610365891.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a79b2b6006---40511930479.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6371t2ejk2222dduoemjjs70a3/vasazedosizo.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/volejerisewipixabowixafe.pdfIn PDF document text
    • http://thegioinoithatcamranh.com/media/ftp/file/jogeloreduzokor.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/fusedagiwuj.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/nubexorunum.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/lewipolusujo.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aad23b12456---lazob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=hazard+associated+with+lifting+moving+of+heavy+loads+are+consideredPDF 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_off00010465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10465 17592 bytes
SHA-256: d3ec6774c348c10b119ec778c1c74d8d65e328f0d52b0e8e3f70fabf852143a6
font_01_sfnt_off000131fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131FB 11240 bytes
SHA-256: 805afacc7f1de5feffa9742ce7f6c2576c38f62d5399e32230204baaf1bfaa3f
font_02_sfnt_off00014c04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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