Malicious PDF — malware analysis report

Static analysis result for SHA-256 d585ac0f2b492bb8…

MALICIOUS

PDF

72.2 KB Created: 2021-09-25 01:30:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8ca3aca1c7784ced5deb96cca28e01b7 SHA-1: 51f3d750577b5d565dc5f296f3ea1a78dba8e1b2 SHA-256: d585ac0f2b492bb84ccbf033635483a2e90cbdf9f3b81daf584a3111ecbeaf32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS uploads, indicating a link farm designed to redirect users to potentially malicious sites. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://epilia.com/upload/FCKEditorfile/61758669408.pdf
    • http://about-dogs.ru/upload/file/62387256976.pdf
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/natuxe.pdf
    • http://madmojo.com/fckupload/file/totejojemepogabugudubide.pdf
    • http://diamant-x.sk/UserFiles/file/7872750049.pdf
    • https://angkaganjil.com/contents/files/74143138720.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16140a44de0f06---jitojilugos.pdf
    • https://peltonfell.org.uk/ckfinder/userfiles/files/89415479995.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/bd5113e1b988027638cbe174d3e8a578/karezuresuwaf.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edd138bd12---80669116085.pdf
    • https://reformedgeneration.com/userfiles/file/58482706147.pdf
    • http://luisacortesearchitetto.it/userfiles/files/3039816300.pdf
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/59244617834.pdf
    • http://autoneza.cz/UserFiles/File/janod.pdf
    • https://biserica-izvorul-tamaduirii.ro/files/dujusavozovarux.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614e44c718f5d---70506439471.pdf
    • http://torby.kbo.pl/ckfinder/userfiles/files/45863186825.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/a9bf1dc093ba3edc633cb6029284b5b9/69598629878.pdf
    • http://magdrywall.com/project-new/christianbook/upload_images/file/26646248709.pdf
    • http://www.bluewhaleline.com/image/upload/File/buferijegusatipujifesop.pdf
    • http://andreevka.topmebli.com/content/xuploadimages/file/10103501589.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/ee97c030ca8aa124c46f00040eb02d50/jemazunojawik.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16139b9db14a5a---99421579287.pdf
    • http://elpijisystem.com/file/48145239574.pdf
    • https://tunhuaduytan.com/upload/userfiles/files/suxifutunogajizuwuba.pdf
    • http://asliev.coco1490.com/upload/file_folder/file/vejubosixu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=stick+war+legacy+unlimited+gold+spartan+hack+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b362.bin
e7aa5ad74ec8be04df8909c4251439e6acd0d6216e9694fa9c036fab011f676a
pdf-font-stream PDF embedded font (sfnt) at offset 0xB362 11428 bytes
font_01_sfnt_off0000ce0b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0B 16792 bytes
font_02_sfnt_off0000e61d.bin
4d4f731114ab80fab22e4f824718e9592388f84b6e323f070e3572b6aedd2bf7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE61D 17104 bytes