Malicious PDF — malware analysis report

Static analysis result for SHA-256 11276def92571481…

MALICIOUS

PDF

80.2 KB Created: 2021-09-14 05:15:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 51709e7d372c09d48a91718ce23f33f0 SHA-1: e3a14e140182a5ccc3f9dabde72a64b8d455c2eb SHA-256: 11276def9257148145b89e936bb4027f2cb1a3d77d48ed51a20a99d6c6e0678c
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various PDF files hosted on potentially disposable domains, indicating a link farm or distribution network. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is not a legitimate document but rather a tool for SEO manipulation or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ee20c46d0---digeb.pdf In PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/37gsn1n056rejn5j1p0cj06ia7/62651859449.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/kepezajatezud.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/fifatulapasemotirofu.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/51618144492.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/latupufagazekobimo.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/45431827748.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/fovan.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/totezifebutazibo.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/23465811782.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/70053660912.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/1244871125.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/juzaboxexabibidageweju.pdfIn PDF document text
    • http://carszana.com/image/upload/File/40268712971.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/vomajosuxuf.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/jatupaponidus.pdfIn PDF document text
    • http://budka39.ru/files/82873271556.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/xoruguwubafomusa.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/85233802279.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/95647654022.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/bejuf.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/xavadebezisotujisojibor.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/54244925827.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=best+call+voice+recorder+appPDF 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_off0000d772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD772 16804 bytes
SHA-256: 29422e492ce16a0807407722aa1b72a21c251df280072a33120a40bd906f9d95
font_01_sfnt_off0001034d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B64 10520 bytes
SHA-256: fadfded4e0e0bbfd64f363a950b01f5e3e59f729672d686290cf66ed7f157597

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