Malicious PDF — malware analysis report

Static analysis result for SHA-256 093a962e428de5b1…

MALICIOUS

PDF

85.4 KB Created: 2021-09-03 20:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cfa98033a0ae0ab47b4b302de65d7aae SHA-1: 21916123416e4134d11053cbfcf05cbdf8234973 SHA-256: 093a962e428de5b19fcf7a0bba5b3b0eca4f8119de4b8aaf6cc4bd1b9ce157b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 many embedded URLs pointing to potentially compromised CMS upload directories or disposable hosting. While no scripts were extracted, the nature of the embedded links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://muasamhangmy.com/ckfinder/userfiles/files/97164437971.pdf In PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/d2caa8ff02a617497b945b24174c1445/zudotun.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/58815690423.pdfIn PDF document text
    • http://barexkft.hu/userfiles/file/polupivubezazabiduzox.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/46e3abaa8c85ccba075f665b7154eb54/77103375208.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/23635678591.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/d2e76a3b4a02b5c89ef8e0a49611bae6/76319572518.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/29661717263.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3d8ddcc38---rafefibapevovokutipilom.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/54015899139.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/25divbubcm85k2ff21a1icj704/bedolovefigomagog.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608065008cb27---64489333629.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdd4b6a33b---moxotu.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/emqvem8i3csc057sfdatnotkki/84808489381.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3394307150---dexopipajovadele.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/wonuwulosovuzafunev.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/72003791789.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/pikom.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/58123353179.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/zodeliradi.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/58fad14d3a14e2cd46efc98848b91334/sasemozenagig.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/fawadukokagezubux.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/verewubewiwidoravemazuvux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=les+formes+de+phrases+exercices+cm1+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_off0000e457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE457 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6E 10748 bytes
SHA-256: a44e54940ca4a7e40a27e32ccb1db69baa1c52dc6639d7f1d199067308ecae2a
font_02_sfnt_off00011532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11532 20036 bytes
SHA-256: c27d59486b8fa052bf70660f0e19bf6441cfc3aa544ce722e58c9d960f881f0f