Malicious PDF — malware analysis report

Static analysis result for SHA-256 25ac1676e4802895…

MALICIOUS

PDF

81.1 KB Created: 2021-09-03 20:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 852a1e942394dd95fdc68b8313205452 SHA-1: c6ee3903a0244866da3a8c74018cf96709ba0ba9 SHA-256: 25ac1676e4802895cca9b9bd486d468f80b33fefb85c73379b4e4d25176d2b08
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://bm-shower.com/userfiles/files/zuxumu.pdf In PDF document text
    • http://kraski-chernila.ru/resources/file/4520779727.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/73691211742.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160be2652cc090---gedisotorovozifefatop.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/difogaro.pdfIn PDF document text
    • http://cocoal.com/uploads/file/59153910126.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/0aeff722ba2f9c395519355d1f518b5c/xetefejumewaze.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb7883874f1---26928233096.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/76080002195.pdfIn PDF document text
    • http://riversedgefm.com/files/file/80522973662.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bca52cfc8---43750007465.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/54320567751.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9aa5d10b74---94481182588.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609db834e313d---tedukavusi.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607909f9457e8---58823219349.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/rogararibekunivibopoxuri.pdfIn PDF document text
    • http://greenvisioninternational.gm/userfiles/file/miripupixajalonanerajo.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/74119887541.pdfIn PDF document text
    • http://ezibra.pl/upload//file/13594041598.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/77267575106.pdfIn PDF document text
    • https://dananeye.com/uploads//files/202108061849258614.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/nmf8se1isvq9tsfb4lsgq8urs2/77415890017.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/pupimi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=nadamoo+barcode+scanner+manualPDF 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_off0000d818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD818 18040 bytes
SHA-256: e920aad55d6a26c8058c249ef6ce0a3ba10cd6a0f07159f77f0dead3492137ca
font_01_sfnt_off00010738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10738 10556 bytes
SHA-256: 70a4f8564a847f22592f49369ee21933eeb694ca3cdf1998efa11449071db0d2
font_02_sfnt_off00011f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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