Malicious PDF — malware analysis report

Static analysis result for SHA-256 0faff935e2e1bcd8…

MALICIOUS

PDF

84.1 KB Created: 2021-08-20 17:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cbf872c524bebbd37871fb413740183f SHA-1: c3eff3624fa6753f7b7f433e1aaac6b315207b87 SHA-256: 0faff935e2e1bcd87750bf318375840a46176fe42cfc1352179393878088b935
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external resources, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristics point to a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e6d275d41---mefutale.pdf In PDF document text
    • http://teplospectr.ru/images/files/42286003289.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/17896111724.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/9ud7q6lac28oln79h8hujs3tmd/xuvizaxugosowir.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/rimitovoxedev.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0bdc54683---sijafesomezajiforej.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/pizoxuvizenoxumu.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/fenomagubafe.pdfIn PDF document text
    • http://yilip.net/userData/board/file/bororafifadovijirekinoba.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/s3he8q418m3hh7l7jtnmeefsqu/xukebe.pdfIn PDF document text
    • http://slsnn.ru/content/files/vetolo.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be00deafb6---49465021677.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/20103338512.pdfIn PDF document text
    • http://thegioioto.store/upload/files/kuvoforufevas.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160add180df6c9---34987791545.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7e4fdefc6---80308358352.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/zizawaji.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/mibetusababikuta.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/n37bstj5beu6pknkusqd48tbq5/fegokal.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/93097085231.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/32042885661.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/vigeratipibuxomeset.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160c6eaa30c3d1---22706398537.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=ecology+population+growth+worksheet+answer+keyPDF 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_off0000e439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE439 16660 bytes
SHA-256: 3e0ae49fccf73f0794085b2cb338c6b644da576655e05eb9d98cd8d87d6f6937
font_01_sfnt_off00010f37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F37 11028 bytes
SHA-256: c7bcb62881b28e32507afd37ebca5bb51b4fb630904bab51ac07bb3aff1c79de
font_02_sfnt_off000128f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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