Malicious PDF — malware analysis report

Static analysis result for SHA-256 f175731debdfe60a…

MALICIOUS

PDF

92.1 KB Created: 2021-09-22 13:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5c102e504c1525ff1553855187cdd05d SHA-1: 70cb3ad01d588ce1f36efc50a1cbc41d05542eda SHA-256: f175731debdfe60ac1150e3ee4bfaf3c8555520bb191322139a455f5fd0d599e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed for SEO poisoning to distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures that redirect users to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://philabc.ru/uplcv?utm_term=pmbok+guide+sixth+edition+2017+pdf+free+download PDF link annotation
    • http://nextgenship.net/upload/file/20210920163215486461.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/93bf14612ce2450b9ad6b9d66e527442/98186949378.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef3cd7dc91---58142228266.pdfIn PDF document text
    • https://servauto.fr/img/user/file/duzozosofefir.pdfIn PDF document text
    • http://hexindechem.com/upload/files/91401706845.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146e2223de0d---35544677111.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efe01daec4---fuwowatakegogebetozo.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/xuzakegimux.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/wivuwi.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/5c2645d8eae1ea4ed9b7f5b9d3f37329/zujonazevinug.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/93659749819.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136c0d502788---22955210505.pdfIn PDF document text
    • http://fuguchair.com/upfolder/e/files/20210904130913.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/14195844218.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/jelokilele.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/27627083924.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/50975341737.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614aff047a397---faruduru.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/11233551449.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/2138289990.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/xurinol.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/neralaxopovawefikebisuga.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/b91d230ff0a2f5f9aa4aa1b782668e95/ridelewalibogawubovako.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/nitimejovesisobi.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_off0000fd02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD02 18916 bytes
SHA-256: b34ff0803acfa45eed5c69639a494b77628749732ccd270dda71e1ef8633fb2f
font_01_sfnt_off00012e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14628 11808 bytes
SHA-256: 08be494ba8aa59ec540d7297bb55ae0b7d4f5a248938bdb468c08b6e20cec24a