Malicious PDF — malware analysis report

Static analysis result for SHA-256 afdc89a29b817976…

MALICIOUS

PDF

68.1 KB Created: 2021-09-28 22:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f53f773b26d76768507b2702c712c342 SHA-1: b004d8dcf989f197f258deaa8611fd03bea2ec81 SHA-256: afdc89a29b817976fd53aad14a419cae9a20b3369145b2f12aa12becc41fb83b
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 websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the links as a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://smobiil.eu/userfiles/files/6174322026.pdf In PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161480a020a962---80315703417.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/pixukokefoxenofoxexaka.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/rekivexi.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210919113806.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/pezurakivodezutivadin.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0716a0272---90369298401.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/jubawenul.pdfIn PDF document text
    • https://558com.vegner.com/userfiles/files/20210918_041549.pdfIn PDF document text
    • https://phuquiland.com/upload/files/mupisoloregegu.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/09dqe4hgdm44fnmmp3hh63ta15/45412959815.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/161415a3b3214d---jiridib.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/38805210582.pdfIn PDF document text
    • http://cib.lin1.ca/phpsites/vertical_living/uploads/file/seselevarodigir.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/winekoxubifidevefazolaw.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/64199931699.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/lakokosamitufizo.pdfIn PDF document text
    • http://corkpotters.com/images/6577835655.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/89927520068.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/77177956285.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/aa1aeccc720c3b83fd498b42adf8a469/kukodutenifelumi.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/86238328466.pdfIn PDF document text
    • http://huiking.cn/uploads/file/222009421830.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=watch+zola+online+free+123PDF 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_off0000ae0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE0A 10664 bytes
SHA-256: 245074a59c19b1213ba9bc878e81a37203c1fa24c338bf171de6afcc8744f617
font_01_sfnt_off0000c693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC693 14412 bytes
SHA-256: fa888ecf6900e8020450a34ca07a648ee41de4925eb548c58e50a66bfb9949b8
font_02_sfnt_off0000eab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1