Malicious PDF — malware analysis report

Static analysis result for SHA-256 8150d927f8f26e8c…

MALICIOUS

PDF

81.3 KB Created: 2021-09-04 13:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 12d79a6d8948ed0b97462425ce954d93 SHA-1: 28669b6c8c621ca79c8e6e4c261edfeeb0456644 SHA-256: 8150d927f8f26e8ca04ee50863ba909dad9486d990d7c0644be9c5f24569b72c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm pointing to compromised WordPress sites. The embedded URLs, including one using a raw IP address, suggest an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristics strongly imply a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084934b614a1---xusijepesa.pdf In PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d400c6ef4d3---majavitepezavok.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d28eec7b3a---sunexukowezazubezalo.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/h5ed853td0sevn8ect0j4up5js/53394937068.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869e1a8c02e---gixupiwevaxikig.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/7ab54ca545194cfbf33abf2e631cb762/75104477693.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d3a363830---nawobosinizozikevug.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/46391442782.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfb268a47c---85345237283.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/98600586514.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/44371391385.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/67m854aukg66do2g5jihnj7s5o/xisemi.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/61415999759.pdfIn PDF document text
    • http://masonhn.com/d/files/63871630891.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/bb85dcc6ab8e068a33ce5d8481fc9730/67090170250.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/70561114260.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160bb599b789e3---tusifo.pdfPDF link annotation
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/209864d7344d5aff28b0c181cdc201c1/golugijedisidujefadopeta.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/nitakaxa.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/fosuzifadebego.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/90a8915941816e3f38cada4b1e315895/27631199917.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=web+application+architecture+diagram+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_off0000dc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF423 16400 bytes
SHA-256: e9593a429d26c97be7f3f85270e0d3e4ac79f064f15c227451d2092734e651f2
font_02_sfnt_off00011ddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDC 11132 bytes
SHA-256: 9c25440ae6665d1dc1f75af7a2dc5f2cbeb882fe2d3866beff5f20d0db1588ff

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