Malicious PDF — malware analysis report

Static analysis result for SHA-256 34d4381f4f1403bf…

MALICIOUS

PDF

70.5 KB Created: 2021-09-01 12:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 25cf034aab28e339450d9c465a229fed SHA-1: 43934bc9c18a12f6292b294b0869dc83932d0a4c SHA-256: 34d4381f4f1403bf60f184791d377b75ffd888ac6c122c92bc116cae840397ac
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It functions as a link farm, directing users to numerous external URLs, several of which are hosted on compromised WordPress upload directories. The primary purpose appears to be to lure users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://bonfiremadigan.com/uploads/fckeditor/file/30675182730.pdf In PDF document text
    • https://perfecthospital.org/FCKeditor/file/ridixapax.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c96736def---kozevekinukasafubofu.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccd68286f3---nidukopivudujatap.pdfIn PDF document text
    • https://capecoralliving.com/media/file/kaxowujabopefexifuroj.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/88935087073.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160810ea5905f0---bidevuboguxoreturi.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cce2189654---5794825246.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608036b426490---62477465465.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/ae1449d66e78f3690e32c2d83b84789f/bireliserow.pdfIn PDF document text
    • https://aedwea.com/upload/foto/52221877128.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/67005837602.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16084aa77cf07e---jekidefanizi.pdfIn PDF document text
    • http://phanbonvbm.com/upload/files/fesopusiwutakero.pdfIn PDF document text
    • http://kustari.net/userfiles/file/rosufa.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610c6e3c9f908---59679179984.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/d9af4bfad44cf73555454f485792b2dc/bikokokubogozerinegi.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/rubevonamuze.pdfIn PDF document text
    • http://sieuthibds.net/images/files/59122144538.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d37f4acc488---nitemapomapimorag.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/0c64c2e5966b38a37af29a464c360ed0/98178563855.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/soraxikozeji.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3aa9b54cc---18517119663.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=irrational+number+between+2+and+4PDF 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_off0000b50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB50C 10716 bytes
SHA-256: 5685fde3598c246dede9e72f775ae3f489807cb726c00368db6fe17ecc87fe17
font_01_sfnt_off0000cdbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CE 15424 bytes
SHA-256: a9f5678df8e8ebed3521632bf911f591a6e6c048fb037d8118378865b9353327

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