Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d6151cad5644c61…

MALICIOUS

PDF

95.0 KB Created: 2021-07-02 22:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 76081c0275adc4cdc2b4ad4de457c239 SHA-1: 7d88726600485e1a7c3efea1f8130d544facb29e SHA-256: 1d6151cad5644c61972b5eecbf00be39bd0ad98ac86f64ab6b8cdf7059bdf5e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites. The embedded URLs, such as 'https://archism.ru/uplcv?utm_term=sock+it+to+me+pound+cake+from+scratch', are likely used to host or redirect to malicious content, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 https://archism.ru/uplcv?utm_term=sock+it+to+me+pound+cake+from+scratch PDF link annotation
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cc751792b---35418395213.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/90264601777.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160acdf72e1a2a---dukorunilidufulerolut.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/bb353fc7a2f55831585ca1c143443dd0/mopikagobogodu.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/36407656707.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a5dc17b2719---78553269590.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/53367436341.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/4223133928.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608af82ebe68c---29230241763.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/f1f518e60018b11feb334020bba6d103/73759615926.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/tftlflv80edmjadig681qria29/zugebumasesodaxajolodobo.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/ig1vsuo24j61c6vs8tp4mos5o6/jejokonuw.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/13196759518.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/b60bdffec354d29a00be0cd4e467738a/68446402963.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/93776229537.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/76975603479.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e4fa286a8---39205852860.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/65741265709.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/95a06f55ab3b27074becd3c099ca63b3/fedabakofebodanopema.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/11981578542.pdfIn PDF document text
    • http://dahchen.tw/userfiles/files/12012421745.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/21368725404.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/05d48bf81d1935163d9c87655e1ea265/gikul.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/xizomaxorusedilewuvejup.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/feaf15f49c0e3ab0425e6fdc23aeb8dc/nelirivaduwobamorowexu.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B40 18808 bytes
SHA-256: 8ab42f196fe18a5a5a430a7b54a3a8ed056f00760f71d536dfa22bad4414949d
font_01_sfnt_off00013cc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000154de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154DE 11104 bytes
SHA-256: 9cf974ca5cda7c512d0bdb02b3ff277f8ecf0159248c56e6f5d7c2accded73ac

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