Malicious PDF — malware analysis report

Static analysis result for SHA-256 eacbf9fd45ca2cd0…

MALICIOUS

PDF

88.1 KB Created: 2021-09-05 14:20:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e91bccacd5bff164b43658a13661b9ce SHA-1: 872393fd35f9390e5a0387d7d3303fe4b71044f8 SHA-256: eacbf9fd45ca2cd08b03aa9e8db344ba9a44caf2bdc6dd9b019be967b4924ad6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, many hosted on compromised CMS uploads, redirecting to various PDF files. The primary lure appears to be a PDF to PPT conversion utility, suggesting a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607564944f7cc---55704211050.pdf In PDF document text
    • http://abacusnancy.com/userfiles/file/zixigogo.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/47373151640.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607989da445bb---biwexebotulija.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/3dad360dbc630013f5a45c95fc6faece/8090492772.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/117e9f5d6bd4841726d2cffc38465fae/dokutuwadevumomojejorota.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/jokovatizoguwaw.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/17193095451.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/57u9bmc75eu37akrkm6nf4on99/46046242888.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/e2add514dda6197936ae8208b8d23d26/69881637183.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/fabolotanuxasozalokug.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/65259148075.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/lipuwiteserimobope.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/1572d0a5e28b7c1381d1cd8f9694fa9b/lizesawipofuxizemamadabow.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5381a3cc0---3281090362.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608769b91b434---76919337393.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/babefovusugilededagefe.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/45196398557.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/39201835493.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a612c821eac---jatezafisitekusetugifezit.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc44878b00---63283228966.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=convert+pdf+to+ppt+online+freePDF 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_off0000f662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF662 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E79 10260 bytes
SHA-256: 0ab5a47dfa689818e4a52ca55af9b2cf19b5df769bab5b628dc2721106017822
font_02_sfnt_off000125a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A1 17500 bytes
SHA-256: 33458f82e809d84f12c0d2f56fd8a8abae56d803b901ef417bbbf496e9e5db75

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