Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc4054741b47d57b…

MALICIOUS

PDF

86.6 KB Created: 2021-09-01 04:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 537415bff40083047fe38ce5401bab4e SHA-1: dcf56dd8abc26e24acd9906187266d0846d6f4f8 SHA-256: cc4054741b47d57b40d8c3c5b8b9283a19ab7bf6fc182021ee596dbf3f57fd98
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress installations or disposable hosting, suggesting a link farm intended for SEO poisoning or phishing. The document body is heavily obfuscated and contains no readable text, further indicating malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://pm-property.pl/userfiles/file/labadix.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a1ccce98b---20231934462.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16108ce35f3be7---50259669340.pdf
    • http://studiomarcheluzzo.it/userfiles/files/zelifuwoximiba.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fe9b817cc---1471493385.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ba2101418---89013561942.pdf
    • http://toanthinh.vn/webroot/img/files/xekividibufafaxixod.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084f8ddb6855---wojokerotexab.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b04c0d4a7ef---gelujazojebupefaruja.pdf
    • https://licorne-hotel-restaurant.com/userfiles/file/33933272506.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/idkv8stdhbmce6gqt69b6d5vqa/bemosadite.pdf
    • https://sardavetri.it/userfiles/file/giwetipilulovox.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/85ibliecoh4jbvfoeed6ipclt7/53673492021.pdf
    • http://abimobiliare.pl/pliki/File/xiwavofakidobo.pdf
    • https://arte-salon.ru/upload_picture/10852642509.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/bb91f1f4fd7017fe7c5ffd9eaafe01c6/68644423916.pdf
    • http://netinflux.net/userfiles/file/13217288161.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe26f48ed4---66006504414.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9ebc1a1aa---2772131429.pdf
    • http://ytovietnam.net/ckfinder/userfiles/files/25719595376.pdf
    • http://conomiya.com/images/uploadedimages/file/73577624066.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609419055bdce---xakonixakagas.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=the+minimum+dissolved+oxygen+required+in+water+to+save+the+aquatic+life+is
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9d4.bin
dfd2e132e997c42928e498fde1b90c00f43f0c9e8c3157eb1fd52da484c57dd5
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D4 11500 bytes
font_01_sfnt_off00010472.bin
81e7562de1fe525f41b00372588e8dd9ce8b76f427745d95a5afb4a0e7ca93ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x10472 18092 bytes
font_02_sfnt_off000132d0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x132D0 16792 bytes