Malicious PDF — malware analysis report

Static analysis result for SHA-256 bac1d69caba5d56a…

MALICIOUS

PDF

88.7 KB Created: 2021-08-11 06:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dc8fec26d9f5a5988028d0830c7923c7 SHA-1: b4ac51562c8d27434ea5472801676a01ed3b3def SHA-256: bac1d69caba5d56a369c737563c2bc26e6b75ac7c12795743e1bc61e4fc63836
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. The document contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites and disposable domains, suggesting an attempt to lure users to malicious content. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://medvor.ru/uplcv?utm_term=grade+7+math+word+problems+worksheets+pdf PDF link annotation
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f78f53b8da---perikoju.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1609091b606947---34012494140.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/tegusogufiwopugimib.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/75710526466.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9752acef59---70806826061.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160890a10277a1---93092675903.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jodikowezunake.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/66643934096.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb4f5c024ef---82636147690.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/18417977407.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160adbbc18eacb---16142010623.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b818c75a445---84393604482.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/60281987901.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/lojinix.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/35158339925.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce6655ffe2---redarit.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/95674170510.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/d8ad3f0c021b13f53743c618ad1f81d7/43097807061.pdfIn PDF document text
    • http://japan-railpass.info/images/blog//file/jimepixunuwalolugezotem.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/sclneab2e2hul2fijaen7rhn7s/57258657978.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/pifusevedid.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/29698143435.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/4488955345.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/ebac50a345bf457d7b590bff05a3b5a2/75821206157.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_off0000f3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F0 10972 bytes
SHA-256: d68490902687413c20ae1942c9339cd543f0c7aa4c0a94336d6aa8cf002e2854
font_01_sfnt_off00010d5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001256d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256D 17796 bytes
SHA-256: ad4cab46d9b0c1c74f67e4244acc0baba1d6122b49125c0dc3cf2e8acd2eab35

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