Malicious PDF — malware analysis report

Static analysis result for SHA-256 73137e3811968478…

MALICIOUS

PDF

84.7 KB Created: 2021-09-04 04:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d613ec74e5b7ba6a74c58e9b14db1fa3 SHA-1: a8ecfbdc5d526acac8182d9dfa98d9c3def84174 SHA-256: 73137e38119684781771b3774ec60642128194b697f9497450ec265689a0dd95
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 compromised CMS uploads or are hosted on disposable domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nomylo.ru/uplcv?utm_term=recommendation+letter+for+internship+pdf PDF link annotation
    • http://supragyn.cz/userfiles/file/lozekot.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/60627237830.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b06c71b11b---35725441749.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/mibejagoso.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/paloxewimariwugiburax.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c04ca1f83---38212219464.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/34558915252.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e34139b5f---25568366479.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/roxig.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/biligenisinozanexigekamek.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cc130f65b---xewinidupemalomixebege.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/ruludif.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc1181e974---24483776948.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/60840505287.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607074204373d---56423294325.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///pepegawutogagonab.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/muxuzuwoliwokelokob.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/pilekidi.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/74443787590.pdfIn PDF document text
    • https://aqualibramontois.be/fckdownload/file/19855438789.pdfIn PDF document text
    • http://otterdisplay.com/userfiles/file/77740679825.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/1b9e4c0148b0745c3a1901b3768979c9/kijudozixiwepo.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/52299355455.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B9 18712 bytes
SHA-256: 0c2b6fb844a0409998ac53bf5f084fefa17b475d2044f371cba227213d82ef4a
font_01_sfnt_off000113b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCA 10932 bytes
SHA-256: b63188b378958345f2d833d85dea5d63e7c8812c8276a3a7d0e8c0794cbfc60b

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