Malicious PDF — malware analysis report

Static analysis result for SHA-256 195a270025a7b29d…

MALICIOUS

PDF

96.5 KB Created: 2021-08-07 17:58:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5f51dac2a3fb00463e58c91f25cecf7c SHA-1: df3c9f18ba04b1db7cc3f1ba9e7ea1e6c2cf2da2 SHA-256: 195a270025a7b29deda0c69a73921330c825873599077a6abc2d8863c7869263
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to other PDFs hosted on compromised WordPress sites. The primary purpose appears to be directing users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/74f25f0738bec1acefa08866206b58e1/77659173442.pdf In PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/186sv1alaperr77ftb2gomcjcc/xaxujiji.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ca138125541---larasovesatizige.pdfIn PDF document text
    • http://klientskazona.radeton.sk/ckfinder/userfiles/files/datusejis.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc062caf1b---36722476268.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/ad80f11edc540d00f824d8950aaa02ff/degepikokinanomogudinare.pdfIn PDF document text
    • http://bscartridge.com/pic/vadel.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/640816144.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/o8lcit0k4srapkr7ec0gp6lnr1/vosukirekoba.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1a13bec0e---9588485447.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/000574a4eb484bd0d76d5ab220f045c1/xatokiwirug.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/78211972772.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/44037893894.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160de27b0a5e1d---vuweledixutufaderav.pdfIn PDF document text
    • https://best-label.com/upload/files/gitozevafotupapada.pdfIn PDF document text
    • http://fygl.net/uploads/file/151510001662.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddff187bdc---62589151296.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/paxonotojosukujim.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8526862fb---wovumemipikazivutiluzi.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b325f3453b9fb868d991c99c564f4455/vobutek.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/73885817315.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/safasojowuzoxadotikoweze.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/zadema.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a6aa3bec64f---20938361010.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/94918687795.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=actividades+para+segundo+grado+de+educacion+fisicaPDF 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_off00010d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9F 19552 bytes
SHA-256: be14a0fd5478b4151382f354d1b26e5129f682bdc90d49c95d86d8dace8e5f5e
font_01_sfnt_off00013fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FA0 10896 bytes
SHA-256: 59aef52b620364b0a071c1bd83ef20da85c1bd97a1fd74d859c3aa13b0ed4ce5
font_02_sfnt_off000158d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1