Malicious PDF — malware analysis report

Static analysis result for SHA-256 909fdc1710acd9d9…

MALICIOUS

PDF

88.8 KB Created: 2021-09-08 07:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7da990e963f0c7ae05e4d3567e99d7de SHA-1: 37a2c4fc023f31fdaaba6c3444e0a02357f15fad SHA-256: 909fdc1710acd9d904b1b01dfa6bbd9a4a9f9b5c8ad193e7458cccba59ca7aee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution campaign, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://philabc.ru/uplcv?utm_term=alternative+assessment+in+education+pdf PDF link annotation
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/5c0f135ae767c2adbcfbbc5864982f8c/6617549829.pdfIn PDF document text
    • https://marmarases.com/upload/ckfinder/files/52288537661.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/70064135935.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/e962b6a83d5ed06c248924419beded80/luzisutekufinevamax.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/32183419667.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783f26ac73a---vovumenomi.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/hr1ptnmfb7tcchtf345klfnnn0/7020676393.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/xisapusibebusafizu.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/72821d523c01c9cb75eaaab1686d34b0/14459625878.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/99213395531.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/rimuwegerijese.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/72726399607.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087beb3e0c41---22196334085.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/sabil.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/52b5976f040cee3dd55aae94fd752795/tafafokugenudakanolem.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/xiwaxasavuguxetuxepuw.pdfIn PDF document text
    • http://trieuduong.com/images/Download/50399654127.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/wegetutamusabelajutef.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/2e163aa42bf88b5b06adac1155c59e0c/salemegamegu.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/81290047141.pdfIn PDF document text
    • http://plncse.hu/php_data/file/34312137673.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/7he1r8u4u88e4r5fk4btlfr866/99752654761.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/86509102002.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010eae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAE 17664 bytes
SHA-256: 62923285c8af9b38b466c4c90f76265f510ac3ad55cf94f9c5d0f44c76dda727
font_02_sfnt_off00013c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C40 10928 bytes
SHA-256: 68ab6895a74aba8570e81e9485de30022d4eff17c8413199ecc3b01e14bd1e72

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