Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1dbc21c26753690…

MALICIOUS

PDF

86.8 KB Created: 2021-07-06 11:18:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 32b93242d2f7d3bf1a1423a190bf197a SHA-1: d08066e4ea7d1c615bbdcbe555333073a6399e16 SHA-256: c1dbc21c267536905d47669737e7ee4dfde28df435a1a1feac41030897a2122b
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links likely serve to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/6t8u2fi22iehmumeju45vvuap1/kexuwokuzixesobi.pdf In PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/momifo.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/79c2db6fb63614f01c0cdaccd0c75958/63456317852.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a02e21bf2e---nakenelamuzebazumokinat.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/eba5b45efe442fdcde1585653916d4ad/65198020384.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/49kln6pe9a31ppcf4mg202v9mi/31507451729.pdfIn PDF document text
    • https://abeess.com/userfiles/file/50897751772.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/pulejogoten.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/1or7s5k6kp55lkls1rtmonslod/xoxofekipatal.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d8b9501b335---24265232829.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/3659adeaaa2c7af18f8adfd6ce58ac0e/domumagazijatibubilalid.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/zafulaxulinupatew.pdfIn PDF document text
    • https://tavio.ru/files/file/90032717044.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/xapiwi.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160c266cba262c---gegepuku.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/f6d4922bf9060a543befb2cdc5604b4b/buzesujobudad.pdfIn PDF document text
    • http://kurdumovldpr.ru/uploads/files/73153855010.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878ef9c7b97---wodewut.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/vuzevo.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/o7jg84ea9q99d0bl4lp5nonml1/57746845044.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/wuwubezavoxagagevazij.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6d7ee076a---96945861649.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/38329854576.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/54f7320d8154f305872e4e959efdbd18/tuzezizipamivebojuwuweze.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/acb84c2cc041875db3b6e62f7b105d5d/66676703159.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210515001834529998691.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+will+you+write+a+good+research+topic+essayPDF link annotation
    • 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_off0000ef64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001077b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077B 10980 bytes
SHA-256: 5e5dfcbd0d266e8ae7bee3e95936b0930f81558a045fb553efddabc011601d74
font_02_sfnt_off000120f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F2 16984 bytes
SHA-256: b7b9adfe5063ff1df4215a7a900f1736331d89a13a8e44d973ba32d3467fa3f1