Malicious PDF — malware analysis report

Static analysis result for SHA-256 94251785d185f044…

MALICIOUS

PDF

77.0 KB Created: 2021-08-11 10:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 404d233d637a5a6b0a635274448b6c1a SHA-1: af4ac66f9c38639ed525464d6bd3fdaed7158921 SHA-256: 94251785d185f0440e43a4acd972fb206fb21a5b5b44627e824a3950c1d348d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous embedded URLs that form a link farm, pointing to compromised WordPress sites and disposable hosting, likely to redirect users to malicious content or phishing pages. The document body is heavily obfuscated and unreadable, but the presence of multiple external URIs and the overall structure suggest it's designed to lure users into clicking links.

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://smidgel.ru/uplcv?utm_term=venkateshwara+suprabhatam+by+ms+subbulakshmi+mp3+download PDF link annotation
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/3b92aca5f6dda303051b8e26a4b82594/19430192903.pdfIn PDF document text
    • https://haidangpc.com/contents/files/tukodow.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/66535182118.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/27634359541.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/12175840884.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/34329478479.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ec8c121c0---88364907986.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f4f7a214a75---lutiruwifukenetul.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/nuritenesivopalobek.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085c42b045c7---pojorasilawejitomibe.pdfIn PDF document text
    • http://k1a.ru/images/files/file/84994765983.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/740880f4610d2de59b46989979ee2558/ludagatisosugavofevorubo.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/66305834093.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/67655441f55eebfb41cb52823574ee29/wujojutewa.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/91455191047.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/94355401377.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8d97e056b---bafidoberapipuma.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/o2cu1pci6ia9n990lcvsugg82p/41614874416.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/39581755814.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/wagoran.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5448dc469---latewuwagowagatesinu.pdfIn PDF document text
    • https://triosms.com/userfiles/file/lololejidebiri.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9e994b6e68---56564075728.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c18e2f52413---17944385773.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/13061725065.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_off0000c508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC508 16904 bytes
SHA-256: 443d72e69021be03a23289fd34bce745055dece2eba9458d1d682bd4d42eae29
font_01_sfnt_off0000f147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF147 11332 bytes
SHA-256: 4b9927be68759c62596bfaf7dd5a8d2587836c9b86d7c3fc4f543c61aea108f7
font_02_sfnt_off00010ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1