Malicious PDF — malware analysis report

Static analysis result for SHA-256 c148cb917ff1ee83…

MALICIOUS

PDF

93.9 KB Created: 2021-09-07 02:13:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5c04af2a5c948f897cb8d48ba5f65ffe SHA-1: faf2b87d3e97b16747cc480d2a0f47932d053ef1 SHA-256: c148cb917ff1ee83110315f0c9e83d60c7131156b9539901f744dfc9f0efbd0e
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, directing users to multiple external websites, some of which are hosted on compromised CMS uploads. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous links to potentially malicious or compromised sites strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://asianaccounting.com/admin/fckeditor/userfiles/file/beviju.pdf In PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/aface0e012f9f22dc1cb561d9564f512/jopasadasoxi.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/mumexuve.pdfIn PDF document text
    • http://brlairport.com/images/file/45186316299.pdfIn PDF document text
    • http://markone-tools.com/upload/files/49145973514.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/kupogazox.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/85843550602.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/tenavudexudepe.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f243120dd---wabadonazesitifamir.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/f2u8r97mopb0kcolbii0dfln8q/rukubisuwuwamoki.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab750694259---xexivexorozulisi.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/79212521067.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607704a478c7a---jojetagumiliwes.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/wovadasufagitimixavasu.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/9a6733c31067aae4abe9081b5bbbae73/jotirafegujinidopetu.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16116eb2a6fcee---12127589141.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/e69b2dc833bd1bacb6e1ec99b450c3ab/75524391663.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/66303c9508e528c32e5c842728111e8c/tujomiropesabafuvotem.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/rexuromikikarinibinoseze.pdfIn PDF document text
    • http://termocity.by/pics/files/jemimarugagotawinafa.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/59128412151.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/10753313743.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/nc5o0m15e0vedaaqfpo1ug6hu5/bedakatelavedopuzot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=reinhold+niebuhr+the+nature+and+destiny+of+man+pdfPDF 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_off00010875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10875 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001208c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208C 11164 bytes
SHA-256: d2ec4c99340f86e1b033cc551aad287d3ba2631fc22a3465d70c4748b285a99a
font_02_sfnt_off00013a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A2F 18340 bytes
SHA-256: f288903e5182dc28d9d161e85fb4d7581ca1d02a0540d946e8592a0983ca938b

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