Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac1d79045f68da3c…

MALICIOUS

PDF

88.5 KB Created: 2021-08-04 04:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2b9093be2c950caf317b02be2e9f22fa SHA-1: 6765a5e5bc4f16b579f3c74517624f28c1594742 SHA-256: ac1d79045f68da3ceddeba6f4073d53965c9231a1c105103fb70f71158779eff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, such as 'https://huntic.ru/uplcv?utm_term=everstart+jump+starter+750+instructions', are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://huntic.ru/uplcv?utm_term=everstart+jump+starter+750+instructions PDF link annotation
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe6c54ecc8---viravuzip.pdfIn PDF document text
    • http://e-sportis.com/images/upload/71266808894.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/61212035477.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/641efeb254ba4f6eefe6ec97f34eeaa1/renat.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/33972906753.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/48808906315.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/mukov.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/biveladetulolevegevove.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/75493102884.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/36061439309.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/ecc271e510d1014ffc972b5f557dd2b6/karemume.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/52389548518.pdfIn PDF document text
    • https://kasihpaham.com/contents//files/gekefaradoditarewinit.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/grqijbao3dh0l4fitub80btqh0/39112421731.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/pisidepime.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/luwipatenaroxomovo.pdfIn PDF document text
    • https://finatwork.com/userfiles/file/nuvazugumapalopevir.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083402879156---tinox.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/ed3b9f81fa66b794e87eaa8319cf08d5/wokedijaxenuta.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/37ebe80ba00cc2475c0dd98cecb2ebd1/21934096117.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/5ff00405b9d36ef5e10c1123e141cf06/85034069585.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc48066359b---bakufutazazidalopagovo.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/40225238079.pdfIn PDF document text
    • 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_off0000f329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF329 11076 bytes
SHA-256: 09947962c712243b2bb09c6e91e26cd4d61ff61e48ae242ef81f6b8c8417c8f9
font_01_sfnt_off00010d10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D10 18112 bytes
SHA-256: 4d44f858d3ea9ac5bdef52eb1aec7be01b16110337ecbcf9097ec31152ba3848
font_02_sfnt_off00013cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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