Malicious PDF — malware analysis report

Static analysis result for SHA-256 155e4c4b3614c3d9…

MALICIOUS

PDF

99.7 KB Created: 2021-09-07 08:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1577fa18721b7e863fb9efbe57244fe3 SHA-1: 49c2263918c1a4331625b24fd1bc1f55723666d2 SHA-256: 155e4c4b3614c3d962449268350cbf46e67775efbf08388a99345d306ba64d9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to various domains, including compromised WordPress upload storage. The presence of 'utm_term' parameters suggests an attempt to track user interactions, common in phishing or spam campaigns. The document body is heavily obfuscated, preventing analysis of its direct content, but the heuristics and URLs strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://garglob.ru/uplcv?utm_term=cubase+ai+9+manual PDF link annotation
    • http://voszveszprem.hu/_user/file/musiduwumadila.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/bowofidomon.pdfIn PDF document text
    • http://skomi.ru/img/files/file/purigadifisibenom.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/84l9mb697miceis46um05vmf53/nemiv.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/1632819820.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8767bbc244---13929809966.pdfIn PDF document text
    • https://efnnma.org/files/file/21743691273.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/96611708713.pdfIn PDF document text
    • http://richwoods1969.com/clients/861079/File/60255653673.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/75717088132.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-4-28/20210428210404487731.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/wafigigegi.pdfIn PDF document text
    • http://hoggard1975.com/clients/a/a4/a43fc1111b7ad4318f8b553feb79a890/File/bidadewemoposutetokun.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/43ddba1e017258b2085fb94e676ddc4c/sigepapefoterukad.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/c0cfe215852433964f67f3bd6140a8b5/vixapiderexedadolita.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021080713044170554.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/suxezibe.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076433f83913---nenexefinovatokirujo.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee3cc35f295---48439329388.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119ee6ee6f4c---6650250223.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/21155463161.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742e2ca4742---60087746325.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_off00012171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12171 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13988 10388 bytes
SHA-256: eb42c9e92313260293d0ec3864b46d028bbd9626475cd4d7376e0443974405c3
font_02_sfnt_off000150fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150FD 18548 bytes
SHA-256: caf1bf1af4d207b45155b8d99a8fd8f0dfd88c5378dce698a49e01fc203c9de4

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