Malicious PDF — malware analysis report

Static analysis result for SHA-256 d024bf9a82f8f26f…

MALICIOUS

PDF

83.6 KB Created: 2021-09-21 10:37:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b4fb443a8b6b280b77383358e3507c3f SHA-1: 96830a9bb01fb5df274d91c208a3ff6e13192a01 SHA-256: d024bf9a82f8f26f94f25e942f467385b95c76f8df37d05aa9fa2fe0539e635f
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The document body was unreadable, but the presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://tythb.com/uploadfile/files/bajagoxejexazevur.pdf In PDF document text
    • http://varosom.hu/userfiles/files/nularadovosinoloz.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131cddb748f6---71818872553.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/84863023200.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/55624839336.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/ganaruralexejamuf.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/23774978488.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613346edbc3e4---ligiz.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/xubal.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/54297688387.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/43628957119.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/morabivozugisivixuxer.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210904132633.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/gifizog.pdfIn PDF document text
    • http://top-caster.com/userfiles/file/76448168011.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/zovesigezar.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/ralaxib.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/95569109862.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/29197645430.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9c5946fd1---30549221498.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/poloxikerakatedepumow.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210919225852.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/46869160302.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=snaptube+android+10PDF 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_off0000e020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE020 18700 bytes
SHA-256: 9692e027f5d4d83a2d1579d682b91557e711dba2fde684be629265efdb4d40e0
font_01_sfnt_off000110b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B3 10660 bytes
SHA-256: c32d1682b45e97c000a934ce549b44e7a7f4087cf2a6a0bd60f37f933a755374
font_02_sfnt_off00012905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12905 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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