Malicious PDF — malware analysis report

Static analysis result for SHA-256 38956c98deeb15bb…

MALICIOUS

PDF

88.2 KB Created: 2021-09-02 04:28:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 74b3cc3f4e6643d364d58036c8257c61 SHA-1: feb57c393e0d91034e01476a8e0f2b12f5e722f5 SHA-256: 38956c98deeb15bbc12d7fbc44f12ec900317680b08ad88bb38c4a67e143b305
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The presence of 'utm_term' parameters suggests an attempt to track or manipulate user clicks, common in phishing or scam campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://mamap.in/ci/userfiles/files/rokowifibawi.pdf In PDF document text
    • http://krikrik.ru/uploads/ckfinder/files/57379747827.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210627125552_404b1x.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c5cd554300a---jepesusaborotisizije.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/3dbeaba9c00417135ee868f7ba5ba28c/22198943859.pdfIn PDF document text
    • https://kaisar168.com/contents/files/53069692074.pdfIn PDF document text
    • http://come2menorca.com/images/file/dukofufanasisivo.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100790c00498---xudefigiwuxixepuve.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/detebarupugegese.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd2b94d762---70179497594.pdfIn PDF document text
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/87607571358.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/3cbf915452684c3ac430c45d14effb45/soder.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/53658486707.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/2bcfcf56f824c88d19a034e231e76326/mazixekuxasewaniz.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/wetesirusoluv.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/87336305422.pdfIn PDF document text
    • http://atrsara.ir/resource/files/rabodesosupesorijun.pdfIn PDF document text
    • http://rfychina.com/upfiles/files/1625511658383.pdfIn PDF document text
    • https://kaimano.it/file/roriderefifi.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f806910b6---xezerawekawugoxeguporajo.pdfIn PDF document text
    • http://tykhestudiodesigns.com/clients/7/73/7311521ca682816632878891c231d107/File/66384221170.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=roblox+mod+unlimited+robux+apk+2020PDF 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_off0000f257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF257 11108 bytes
SHA-256: 46af8dbe4e72e514f96b165226db996c4c949e25bb5f559671a50eb1bd4fe24f
font_01_sfnt_off00010c05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12417 17556 bytes
SHA-256: a2d432c3281eacc6536943fd78791e0590a46704195443ab0430b302c90474b2

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