Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e7132c922484ddc…

MALICIOUS

PDF

86.7 KB Created: 2021-09-09 17:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7fce723366384c0a43f5a941f4c2dd2c SHA-1: ac032234c2adbdfd2fc33755cc3825ac3a75ade6 SHA-256: 3e7132c922484ddca31c3a257100b899a6a1a4d0306d287c32c9b2cb3290cb80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads or disposable domains. The presence of embedded URLs and the PDF structure suggest an attempt to trick users into visiting these sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://trompis-tondschungel.de/userfiles/file/54637682619.pdf In PDF document text
    • https://ikima.fr/uploads/file/mopuza.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/bd22c148dae10fd7d49fc23ae5da0b07/rovodalava.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/19274788448.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/tuburovizakoraxapixux.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/vvadv09dm4r24rc1gompu7l4am/42231790131.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/36864081448.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/jobinitofazamosodirogi.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/47808223181.pdfIn PDF document text
    • https://ngenadmin2.nextgenphotosolutions-beta.com/app/webroot/files/file/tetatozufapakazodeb.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/geposijajetotujizisu.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/69666612034.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/kisad.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/lilejenim.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/barazesafasiburito.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/naluxezewuga.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///bunonavebawisoxivepulowu.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/jevopuvolu.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/2d1sbp0plu9cvk2ascs1b1o9uu/limegorule.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/7b7fd206dcdb103d9edc618480d8e5db/sudokomitikaxekajevugaf.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/6069900213.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/likun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=naruto+shippuden+ep+137PDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/15629350877.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_off0000e118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE118 10796 bytes
SHA-256: 89c357d993d459c63268c3d15e812734cc67149b46805cee1eb5a2f2925b1a67
font_01_sfnt_off0000fa07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA07 22180 bytes
SHA-256: d9a96407f0a54887d34eaf9ae35f8da84e5cf074d48f475ea93b7f292575600b
font_02_sfnt_off000134e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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