Malicious PDF — malware analysis report

Static analysis result for SHA-256 d71a00c4937d2f27…

MALICIOUS

PDF

78.5 KB Created: 2021-08-13 21:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7819a55ed8815cb329247e9ab50947b3 SHA-1: 60d2a7ba6ee534fbdcd31b8046e9f64215073906 SHA-256: d71a00c4937d2f279b6325d1fc98284aac3af85a4aa71a52939a8180b1a717ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting an attempt to obscure the ultimate destination. The primary purpose appears to be directing users to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kleiberit.ru/files/file/77842295787.pdf In PDF document text
    • https://108pizza.pl/uploads/userfiles/files/50631194704.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/37329141560.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/noposatada.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7f76fdaf30---94864255639.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610c0e6b2bb95---23084072781.pdfIn PDF document text
    • http://eva.am/files/69a8781d9d0f3924.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb5ece7897---bugel.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///jiroz.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adef0d1d499---9924991554.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/b479teb30171fdbgptiva76rkf/notonafezitazog.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1a1dde7648---31875001995.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/82444772693.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e76d8d22e---nugik.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/82359183214.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/896537616.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/muzevodiseginoripofopak.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/niruwimajogeg.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/c3a86ba8267eeb92cb00673c19e2ec9e/8787533414.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/blv53egcc6krdpauibhgks4gg0/remer.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/larokerojiguxo.pdfIn PDF document text
    • https://ebdaatcoop.com/userfiles/files/kuvomufafekapurigivi.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1e82c020e---janedaginuluzawutunojovi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=appetite+pro+rounded+medium+italic+font+free+downloadPDF 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_off0000c46a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC46A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7C 21108 bytes
SHA-256: 2a10b1478e7186462eff0099e77b3621659e376c89107446f4354471397daf26
font_02_sfnt_off000112eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EB 10780 bytes
SHA-256: b7da7af4e6cf3c41922ab0e742360526e5bfa46843c3d2ec9af21887ced7dd43

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