Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a78f3c174d2ad06…

MALICIOUS

PDF

74.8 KB Created: 2021-09-09 22:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 817e1e8f88a738af2f5852cfc3df540f SHA-1: de4c1cb4e1c631e5fec592aea773813cbc024d97 SHA-256: 3a78f3c174d2ad06a83ca8306c3b47c2d74238558a0d9e280de9fec1f6754a50
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to trick users into downloading further malware. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59980167921.pdf In PDF document text
    • http://countryclaim.cz/userfiles/file/wuduvevubamawu.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/29645738254.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/51033816672.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/jivaza.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/95123946059.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/67744310335.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/82391638790.pdfIn PDF document text
    • http://jaatkinson.com/userimages/53228379547.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613740900cb46---nojowikojonokuto.pdfIn PDF document text
    • http://seritour.com/rsm/files/bexalapaboxusiwanerinog.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/20912971284.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/1120031209.pdfIn PDF document text
    • http://ipllaser.in/uploads/94022338254.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/qkrh8ea8379ljan138m56dohp5/29473718558.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/53330446108.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/m8aqofm5l26t9eustretffqrqo/98223934309.pdfIn PDF document text
    • https://bczenekar.hu/files/file/midofenevujuli.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161328abfe1c7b---makotugawisizitubumozel.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/68368980692.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/67139800353.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/72741197257.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/80836166763.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/benisufinivepefimasota.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/24278704364.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=longman+dictionary+android+downloadPDF 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_off0000bdb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C2 18372 bytes
SHA-256: 2e771ed17512adec5d069b3abf4722f7c9a1e94737f3c27a8640dc2a3435584d
font_02_sfnt_off00010599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10599 10572 bytes
SHA-256: fa7c8cad26091230866f3f1625026eb74598d14776365349b9ad404f8122d247

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