Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a439c26b4f082bf…

MALICIOUS

PDF

84.0 KB Created: 2021-09-21 07:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4ddcf3f1e98ac57b0494c8d2ff6b9e2a SHA-1: d69aa4d622f6c0421d62df34520d0d59fcb378ca SHA-256: 2a439c26b4f082bf96703ee6e4919cfe6901776ac63559b7a87a25ade478dd20
164 Risk Score

Malware Insights

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

The PDF contains numerous links, many hosted on compromised or disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of a 'link farm' heuristic and the compromised CMS upload link further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://kondicionery-lobnya.ru/upload_picture/file/tobezuzivajawomobobo.pdf In PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/850dfef7e7af8a67848261474a34d2aa/naxavenesupubet.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/9877215664.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/16580299013.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/tusewakujoxunegaxixus.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/nufukikenep.pdfIn PDF document text
    • http://hoachattn.com/image/files/nexododudusaniv.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/31522211299.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29578188067.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614435ae9af01---60351858643.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/vutirisama.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/banuraputesitizejunonevav.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/nawobopesusobopep.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/rupivativowake.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/balugemejipewa.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/72022730343.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/54337867289.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/95182627409.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5b59bd10c---xijenugewepal.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1631697392266783214.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/xedoboken.pdfIn PDF document text
    • https://bipalisdemo.dashindonesia.com/userfiles/files/turozovugunusutiluvimimo.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/38012865792.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/6255474552.pdfIn PDF document text
    • http://saraswatishikshamandir.com/singhania/downloads/file/23306091295.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=essential+university+physics+3rd+solutionPDF 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_off0000e1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AD 18080 bytes
SHA-256: fe75079e0a025ab4d4c02da636c5a7bbdb9e997d098bd4bc11314db8aeed2da0
font_01_sfnt_off0001102c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102C 11048 bytes
SHA-256: f67752557073e802dd2a80b6390d5e025f685adda9d011fec3e1f28c9ed73a11
font_02_sfnt_off000129e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1