Malicious PDF — malware analysis report

Static analysis result for SHA-256 af12c775a4e41b5b…

MALICIOUS

PDF

75.0 KB Created: 2021-06-25 17:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ef05ed0fbff0cf4965b8c1fff2899c79 SHA-1: 5f5bcffe3035f73e9158ed87b027137388f022c2 SHA-256: af12c775a4e41b5b4086cbb6a1acf11b78b0b75af8ec33c8910655a07885c280
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, containing numerous external URLs that likely lead to malicious sites or further payloads. The presence of compromised CMS upload links suggests an attempt to leverage legitimate-looking infrastructure for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://laborke.ru/uplcv?utm_term=changhong+air+conditioner+user+manual PDF link annotation
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/4a97b8db1dfc7f825bfce392da4ca7de/66250535041.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/37542912283.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608011d37f4bd---xunisa.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094d60f2deb3---kunikabapoveripud.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/92ulunevtcl3802fdf5sau7t56/gogixamobedofuduvamiregu.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/97p893f9mogqj3hvh7a45387f7/sifaxa.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077bdcd3eb7d---91449468993.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/63917674303.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/8da870d0269625cc6a3eb32f80e296fb/61892459940.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/72384183348.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/3975c91d99ce085c59cd4ee4d7197b57/98394623058.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbd2542266---velawamunisutosejili.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084fe5c6017a---tezif.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0129ce981---rerojarimem.pdfIn PDF document text
    • http://dogable.de/userfiles/file/vevinuzogoge.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/felabagaxutodofagelefeda.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee8fc885c5---demevelupavexezubar.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/ducpobvj1khphf1jfl4smpj203/56263518701.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/16162705358.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87397cf574---68597802874.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/makamegosubuteka.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/rubofiraluxovo.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5087a3bc9---23018149418.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_off0000c2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C6 10948 bytes
SHA-256: 98fe4b183fa0044b707e3555852efe090ec57a20d845f48c03601855f1af63b7
font_01_sfnt_off0000dbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCC 16516 bytes
SHA-256: 2be92f68c15174eb571f9bf9d4b2a1537f0df42efbbfc2249fc47aa21a2fb136
font_02_sfnt_off0001067f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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