Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d03cd01e9fa1806…

MALICIOUS

PDF

83.4 KB Created: 2021-09-06 09:35:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a74b35e9d91de83426661d6d96c3f8c9 SHA-1: 958429c4b48f090d4fda8a5e6d0b9900b3269162 SHA-256: 0d03cd01e9fa1806f8a0bc3bf98659f6c6fa9af48a864f8fd573efab1a3471cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' reinforces the attack pattern of directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://chcial.ru/uplcv?utm_term=antihistaminicos+para+lactantes+pdf PDF link annotation
    • http://kargo-box.com/uploads/files/32038384.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/1455981421.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210903100646.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/34566552538.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/malibunigepala.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-2/20210502165133829675.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/khs9s39nl11ec8esht3o672fv0/kiwopatupoteru.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9ea44b498---ganifedut.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/wiwuwafomoku.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e941394ad---pepofos.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160febb9258b8d---33410408824.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/72545038712.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/usm03dakej3jogkj0f05hiopc8/71138360513.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/n2conhq0bo92fl34abujlkguc5/rufepevisuzu.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/danabepapibasax.pdfIn PDF document text
    • https://qualitymattressfactory.com/admin/userfiles/file/49357692681.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/73191028084.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/sinebik.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c013832bab5---naziviraluzezafixadet.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/rekilijifalasodijakilemu.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/vasenutirewubavizivu.pdfIn PDF document text
    • https://twfern.org/upload/ckfinder_temp/files/20210526214507.pdfIn PDF document text
    • http://dyweisheng.com/uploadfile/file/2021081713002773499.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_off0000de44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF656 19328 bytes
SHA-256: becebba496494e777ee2dd3c4046973862467b3c99f47ba87e71986cfbc29035
font_02_sfnt_off000126ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126ED 10868 bytes
SHA-256: 9d08744c8c6824acf538f530849622fb88d5848a9311b1b4cff7b19feb7fc9e9

Open this report in the interactive analyzer, or submit your own file for analysis.