Malicious PDF — malware analysis report

Static analysis result for SHA-256 a44aed93997855c2…

MALICIOUS

PDF

75.8 KB Created: 2021-09-07 21:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 4f7dc9c5ed086eba008c934a441fea15 SHA-1: 80790a3961ac6c4af3034a6f971098189f4eaafd SHA-256: a44aed93997855c225c906f4545b5f71bedab8c7498117341f2728552680da94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to domains flagged as compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware distribution sites. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic firings and URL analysis confirm a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://inannamsao.com/uploads/files/46401986106.pdf In PDF document text
    • http://agcslohian.com/userfiles/file/68090034375.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/jazarufamaxejuzixazugike.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f430a05fe7f---gobesivaxe.pdfIn PDF document text
    • https://777mto.org/contents/files/waxexuzotatozikafosuw.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/47982958946.pdfIn PDF document text
    • http://masseydogs.com/clients/f/fc/fc2e217ffa4851e49ca3cd921a15cf41/File/67822974475.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/felitorodamigadoponog.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/40052999153.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/66266768466.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/567ae55d183800a7c2425799903f9b3a/dijunusijilogor.pdfIn PDF document text
    • http://ciskmv.com/css/file/72069899552.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/71887847666.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/mekemefevebes.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/67100745977.pdfIn PDF document text
    • https://samowar.ch/upload/file/5005282892.pdfIn PDF document text
    • http://epoetryworld.com/clients/53741/File/18468031229.pdfIn PDF document text
    • https://rm-parketi.si/uploads/vasanaxizomume.pdfIn PDF document text
    • http://byecook.com/ckupload/files/sofukugikun.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/15368650802.pdfIn PDF document text
    • http://24cvety.ru/upload/files/52199338455.pdfIn PDF document text
    • http://www.77ice.com/upload/files/rurarelepokolapuzidivusi.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/77547908778.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161239f97d79ab---41276348191.pdfIn PDF document text
    • https://majubesar.org/contents//files/39663550539.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/57627333007.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=teenage+chore+chart+pdfPDF 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_off0000c5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CF 17060 bytes
SHA-256: 4a14903561224dc492eb8ad5b2171ee7f3749e85a2de59530551902bf13aadb7
font_01_sfnt_off0000f211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF211 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A28 10556 bytes
SHA-256: 64c4f03c054b2cb63b3f333e5d2ffe6e1a9674b6019358c36ebcf67a51bdec51