Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b057ed1b5eeae70…

MALICIOUS

PDF

83.5 KB Created: 2021-10-10 08:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 386c350b91b99b593efc5db8640f2812 SHA-1: e6098190a1cb5448f7fe0216a58a058d4fdb3d58 SHA-256: 5b057ed1b5eeae70ba41753ce0f8d38a5eb251d678193d8b886a0b078281abec
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various external websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The heuristic firings related to link farms and compromised CMS uploads further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=noodles+high+in+carbs PDF link annotation
    • https://excellencetogether.com/img/files/file/28867181492.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b65de864e0---pixepefawad.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/74192174940.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/sakedalexebejavefe.pdfIn PDF document text
    • http://szigetkozpalinka.hu/userfiles/file/bilex.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/74902549280.pdfIn PDF document text
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/renupudavulenu.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/jasinumipo.pdfIn PDF document text
    • http://i-tos.com/userData/board/file/17856860980.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/xepotuji.pdfIn PDF document text
    • https://renault-service.com/userfiles/96411197014.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/38889617242.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/49292981971.pdfIn PDF document text
    • http://unityproductions.com/upload/files/nejojomolowi.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/09e861052f2f7c69ada3b5a7fe5d6297/74827084250.pdfIn PDF document text
    • http://scoutpate.de/userfiles/file/94729134330.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/muxelib.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/161471feedb09c---72605755614.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/rowepigonubupavuke.pdfIn PDF document text
    • http://adriennemason.com/assets/files/guzedosevumoniwuvinele.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615435948ca5d---19967357636.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/bozaberusozikutoxewifujez.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/56968455691.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614cde9d516e8---72126073654.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE41 19044 bytes
SHA-256: 37911ec2cd25f89027d5ff440bc6ea4370045a2d7a223f09b0efa6dc1464b5c4
font_01_sfnt_off00010ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFB 10668 bytes
SHA-256: f5155781ffb9ab1902292a6851d61d6d401fafe0fbdbf3184bd03bad1b6395f4
font_02_sfnt_off00012817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12817 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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