Malicious PDF — malware analysis report

Static analysis result for SHA-256 716747fdb46e4db6…

MALICIOUS

PDF

111.6 KB Created: 2021-08-24 08:05:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9b8eb3a4d68a559c3b0eda73acdbc444 SHA-1: 9ea760d3c1ab785b3d845052c32fc7d749b26ea8 SHA-256: 716747fdb46e4db63a2086693e1de668eaab266430c0c3fc18e0e95ab5f687eb
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised websites and potentially malicious content. The presence of multiple external URIs and links to compromised CMS uploads suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://laborke.ru/uplcv?utm_term=dashboard+template+html+css+free+download PDF link annotation
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c66beaac41---43227528431.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/xokavizi.pdfIn PDF document text
    • http://walker-doss.com/clients/4/45/450b4a4af5ff3f13851793278d9c7ef8/File/38092528400.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e015524602---varuvol.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/wumilu.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/xelotodujafopepimo.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/jetozamo.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/29267192528.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/kajebidiba.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/53a592c5e2f158c37915f77d4864304a/97834556250.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/xidugisavoganit.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210603_1F7DB73A6638F076.pdfIn PDF document text
    • https://emmaushuis.org/pages/49774973091.pdfIn PDF document text
    • http://farashimirooz.com/files/28961675768.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083db3d42d5c---wusagelizopevajibubure.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/a4029813c19ebc9d070d9bc4e70e9dea/7727058218.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/uc62ku6jde4t7hi833k7i9j5t3/52169933696.pdfIn PDF document text
    • http://grimastone.ru/files/41774455959.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/89f2251ad85989c6d035e1e095d6fd0a/jafixizuralulalo.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/dizivixipupanusewoj.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/zokuki.pdfIn PDF document text
    • https://rosycaffe.com/file/66093633760.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ade4f66aede---jokawegagiwu.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_off000153d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153D2 11020 bytes
SHA-256: b6549248462d61a2974047d6bd571ab372de54af450bc82eb669a516b0e9b7ca
font_01_sfnt_off00016d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001853d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1853D 16384 bytes
SHA-256: c8011d9e1fab2b3374e0043e939b1b9015067e965e6ce77d713721afc3b21047

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