Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab34003553f5ec04…

MALICIOUS

PDF

85.5 KB Created: 2021-07-17 23:44:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9885efcfe9fe798efbd3b7cbdca6494a SHA-1: f998aa4e80e4136220bbda12714ba0c49e489033 SHA-256: ab34003553f5ec0440c5bdde60adba655bec3046f24edd3bdf898ed6cf01a02a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm on disposable hosting, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e61896e4c05---36475685602.pdf
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/watujazakajap.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/5i9g00vrm9t28e7mj86l0ff8al/pogodomaziluzajuwuka.pdf
    • http://smartraoptics.com/fck_filemanager_upload/file/19265396959.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/50d65d4063d62cc37ec95823119ce94e/95798277660.pdf
    • http://dzbnf.com/upload/file///pubosofanomowumipowej.pdf
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/4e16129c76d752b1167f17f7b5fbc963/70268377692.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d90c445145---feporemomukibin.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/fbce472b816a9705e2ffd5f24c9e5f0f/wawuluz.pdf
    • https://tailormade-sales-marketing.com/userfiles/file/85458676656.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/50de20f6d3ecc899acf46d7c398d1988/34340378051.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/b2833f3f67fe5714c1158f756aed065d/81513719825.pdf
    • http://cukiernia.eu/upload/files/66255266258.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160af3f9df308d---xukimezo.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c963bcacd43---33501782930.pdf
    • http://massimosusto.eu/userfiles/files/7894165047.pdf
    • https://aucordechasse.fr/vosImages/xasavidafebipurepovedege.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/0cb45018740048a5ad07f1b0b0a9a675/11032867226.pdf
    • http://toyotarent.kr/FileData/ckfinder/files/20210616_70265EFFC545B072.pdf
    • http://ajtoablakcentrum.com/_user/file/60999911114.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/3d459a9a3452d2c5431a18e071063400/10637086863.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/32ooisbleonmnagrr75tu833vk/femutatevakasatajubesozax.pdf
    • https://dbjadow.pl/attachments/file/guputenuxirudixezorumox.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=ps+to+bmp
    • 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_off0000ec52.bin
94313f79a516c1fccc79e432c35188093d2de59d14fe14a2ec5c0f3ee5e8e80e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC52 9916 bytes
font_01_sfnt_off00010208.bin
a8ecef72bf4486644c633a79625ddbb6a1a170b04a5ed38cf8cfef8683bed3c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10208 17916 bytes
font_02_sfnt_off00013113.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13113 16792 bytes