Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa381b520a0d285f…

MALICIOUS

PDF

82.5 KB Created: 2021-09-17 21:56:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: eed0fbbecf8232963a24eaf0e0b5009b SHA-1: 826aeb1ed6601049d472c473f251e68c1c8feac0 SHA-256: aa381b520a0d285fb7807309a696df284564830f37fe8c36ccea273538dd59c4
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised websites or disposable domains, indicative of a link farm used for phishing or malware distribution. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly supports maliciousness. The document body is unreadable, but the heuristic firings and URLs clearly point to malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=reported+speech+advanced+exercises+pdf+with+answers PDF link annotation
    • http://lavalnerina.com/userfiles/file/ziwose.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/41026698525.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/29267465114.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/pelunufebagifepewobi.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387a834885d---xukavonavonowegaga.pdfIn PDF document text
    • http://punaide.com/userfiles/files/93943523440.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/navidan.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614214dab109b---xezegilufewilab.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/65908804099.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/88556355631.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/b453fed7641f26579adf833c28198b67/wubetemisuwawomozu.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/rubudadodag.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/70786332198.pdfIn PDF document text
    • http://vincentianssjp.com/userfiles/file/gerixexiloniboxiwafoziro.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/gebibuj.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/66322651903.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/11536378229.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/bogibikinifoxo.pdfIn PDF document text
    • https://venus-forever.com/image/files/saguwedilojogetiri.pdfIn PDF document text
    • http://haai.org/upload/file/82998056817.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/pinetefejamowina.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b19864c8c8---vajafutezesuza.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/27610241674.pdfIn PDF document text
    • http://leeharringtonhomes.com/userfiles/file/57044460817.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_off0000dae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE6 10968 bytes
SHA-256: 1c46eaa1808bb3e7adbba62ee75b28e7374128f9cde53681641d5a124818077e
font_01_sfnt_off0000f45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45F 18052 bytes
SHA-256: 8f11a02a62a979cb949f913321850e11daee2b59c619ef0d53e80370add764b2
font_02_sfnt_off00012343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12343 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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