Malicious PDF — malware analysis report

Static analysis result for SHA-256 52eefb7c8c46dfca…

MALICIOUS

PDF

106.7 KB Created: 2021-09-07 21:33:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2137b4abf6e291b2aa5a34301e6e5ab0 SHA-1: 4b8c020f47458615329ed659bafb2f2af505bb96 SHA-256: 52eefb7c8c46dfcaf39322fbc85a1315051eb6cabdec3b10f6585f64b268549b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the nature of the link farm and the detection as a trojan indicate a likely intent to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://thegioimercedes.com/upload/files/30621518529.pdf In PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/f79a24eb5c5a8306130e1dd8bd8bda88/lonixajomiwixipimedin.pdfIn PDF document text
    • http://afro-safari.com/upload/files/22203614798.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/radawatod.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be2e62bf254---59405121097.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nikasa.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-4-30/20210430080554555642.pdfIn PDF document text
    • https://anakaygame.com/calisma2/files/uploads/36395521905.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c0b03b6ddf75e80d58fc6c5edce121dc/pivedalufijoso.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/kl6gkca47gffjm14t7pbcsfaic/38200362540.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/19351135894.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/motufavipalizowozujos.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/c986ea8573e6ebf6946f5af0a8c9c703/96546363849.pdfIn PDF document text
    • https://partnermind.cz/images/files/33539992904.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/52810698509.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/93e0cb64466e39072c58abd84443292c/73280594023.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f14499508---dirarorapamixejapep.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/db5d56ca8fbdff59c950b0c9f1b03d00/19312106127.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee69aca5d1---zobadila.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/barip.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/zogonatuwibokafetugidi.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/79184053534.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aff06ede7bf---tozepezati.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/1964213437.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/38319686646.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=arti+sejarah+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_off00013553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13553 10436 bytes
SHA-256: e56bfe55345e4f87970ff7fc99fe9625a559dbe2ed0064271f692fbee92d3562
font_01_sfnt_off00014d20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16532 21420 bytes
SHA-256: 2364e728439c97f3a407e3af4842ec7ad628eac59af845c8b71ec519a008c4b2

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