Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cd803658083bf43…

MALICIOUS

PDF

94.8 KB Created: 2021-09-06 08:34:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 03d87f523a151f30cfc29501d5b8a513 SHA-1: 52a2016759351030f31e58a66d9bb8117ec622f8 SHA-256: 9cd803658083bf4310a310b5ac477742327d1466bf0341152e9ae7cdb95cdedc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The file's structure and URL patterns are consistent with a spearphishing attachment used to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090458e2acb9---ganewikotug.pdf In PDF document text
    • http://mcelvain2020reunion.com/clients/b/b5/b5167212b805812c9439186484f80f5e/File/zowatugofisotebapefig.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/vototetigowijesaz.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/i48c6j16gr8hor1aentb389hah/gesezafojup.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/edeee657bbb696f73d03ed90fb4202c1/28497776418.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/jusawevanubopuziwojuna.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/240e0ce440820c37935d33eca741e3dc/96348885047.pdfIn PDF document text
    • http://landia-print.com/pdir/file/xatozituzijisemewevit.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730e12c2ff6---mogigopetakij.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/30419938811.pdfIn PDF document text
    • http://c-amc.com/upload/files/kubuwoxamezusi.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/jajizokuzovu.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1453537cbb---lavokadeg.pdfIn PDF document text
    • https://miet.hu/kepek/febujofarowagagakaxu.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160730fec89a51---noviwufanobobububoxoni.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/levonelediv.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/41520341685.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/2oreu3bua9afu98n9dnlnuk9pi/bukuvutusisikuxera.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d8f4b3bbf01ab16c9f89f7f5c2db2021/67803760264.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/43296946109.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d685cb7db7---zarivolufopizekuzelifu.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/d89e52849115a9dd88eac8c0803141c5/wurej.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/1hpkpa5c55e3frrt8v3rlh1j9q/81352467147.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=convert+to+pdf+for+freePDF 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_off00010f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12753 10120 bytes
SHA-256: b6265e78823f6be7cd503f651a52f768c2432b373322e7a57e6574b4ed172f3f
font_02_sfnt_off00013e0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E0C 18452 bytes
SHA-256: ba0c79533b026fc9f892cf91184c64ae23ae076ac4de5cff01ba23d5ec1adb2e

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