Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2372cbf4b5130bb…

MALICIOUS

PDF

74.7 KB Created: 2021-09-12 16:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: babe3298c45e91c119263d0fb1ad99e3 SHA-1: 248833f1e6ab60c6e3f6a4b9fe475c6f1c24295c SHA-256: a2372cbf4b5130bb801dc9bf034288e529289225e1ab567cdf1d872b8389d6ef
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to disposable hosting. ClamAV and ML classifiers also flagged this PDF as malicious, specifically indicating phishing and trojan characteristics. The presence of multiple compromised CMS upload links further suggests malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://garglob.ru/uplcv?utm_term=turbografx+16+android+emulator PDF link annotation
    • http://dighakanchaninternational.com/FCKeditor/file/weboputoradebi.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/xuwovida.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jomoturabilasa.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/80000708411.pdfIn PDF document text
    • http://web5gstore.com/Files/files/96966604975.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/31783963581.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613d00b997432---neterena.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139fa2d9915d---13676363919.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210911_233029.pdfIn PDF document text
    • http://mocphatreal.com/assets/images/ckfinder/files/15885724675.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ed8cc315d---88234025750.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/muvabevabix.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/sinok.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/75101823454.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/manok.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210902_8D5FC7034A2861AD.pdfIn PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/87174670072.pdfIn PDF document text
    • https://limsurempat.com/contents/files/95142178477.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/47325025245.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba207a607c---zumitukafusixadewuz.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/43232814551.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/gelivalefa.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210910_152713.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/nimewa.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF18 17076 bytes
SHA-256: 0d3791281d8f4bee92ddcf7f59247a83a3e75fde2c8a89b3ea22f06532f33d01
font_01_sfnt_off0000eaee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10305 11056 bytes
SHA-256: bbcef7c16b06ffcceac229153efbc2d6fef59d67d7761c16e0d9f5b6bb256eaa

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