Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3ea10d7bad46952…

MALICIOUS

PDF

85.4 KB Created: 2021-09-07 16:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: af40b599c1240e796af15ae0669b70dc SHA-1: 3401fecbd8b58565a94a71ac47d9af165152ce7a SHA-256: d3ea10d7bad46952dabe71d229075f0b734ca7943511ec2c76e99975b73e5844
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external links, many pointing to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. No scripts were extracted, but the presence of numerous external links indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://allamericannursing.com/userfiles/file/38834558420.pdf In PDF document text
    • http://stalmost.pl/userfiles/file/xivelevokoxofi.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/80009930153.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/diwepizovixixepade.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/25c2b3cf8bb11b537a4c469d3a253c33/wuzitexuguguzapizug.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/57047175653.pdfIn PDF document text
    • http://glassick.com/userfiles/file/99008967804.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/16842282922.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/a11746c09be8e7e2392445914fce5347/rukiwofo.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/3820937801.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/87904134027.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/duvamimujo.pdfIn PDF document text
    • http://europavloeren.nl/siteimages/file/69287990795.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/a9fa1ac870be96d099ddef3980173738/zataxa.pdfIn PDF document text
    • https://ecole-anglais.com/upload/files/9717816170.pdfIn PDF document text
    • http://terminsk.by/pics/files/34773134210.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/860116e8c682bdb88ddcd4b9ff0cd927/fifukagofa.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/76d41e467e3fe74bf742bf7f5b0c3760/pijifasinaxevegen.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/75188505089.pdfIn PDF document text
    • http://autovoda.ru/upload/files/53747072027.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160819012c015a---91030071292.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/7cbd46fb2b676c623c0da50572a8c23f/36826143396.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d6e6404222f---dojitufezuguxisuxusumu.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a741e1241a5---65126044630.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/beb8e510b6e82edac53ae4e03abc5b1c/59381588143.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3e45d62cf---zixukipak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=weaving+it+together+4+pdf+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_off0000e65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65D 10832 bytes
SHA-256: 4674ff16e30a22046e5832be95e1b7eb3e7c896e18ed9060e320bd1be24dfe38
font_01_sfnt_off0000ff22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF22 18416 bytes
SHA-256: 19be00d8447bf4a92d9a0ef705c431da668be1afead79546bbc4afd3f551d8af
font_02_sfnt_off00012f02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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