Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a5a35ad465c194c…

MALICIOUS

PDF

100.3 KB Created: 2021-07-04 02:04:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3663b2765c28d1e305766e49f1735e47 SHA-1: 2fbcc343a9bbbd8ec5e1f5a0b6242289ac87990d SHA-256: 9a5a35ad465c194c2c19a3d1a17ab14e8e8609f015a0d152a7d08889090a939a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160955e0331f2c---tolusitilegasukavelax.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2c24d05a1---74000197206.pdf
    • http://ottotech.center/userfiles/file/2435822948.pdf
    • http://phuwangnam.com/user_file/file/kojuwikokozolefenomufenew.pdf
    • http://immobilieninvestors.de/userfiles/file/77373748839.pdf
    • https://costabravas.com/uploads/localidades/files/66960180127.pdf
    • https://alnahamgroup.com/userfiles/file/95797618770.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/meo9f41kd2n5jrlilk746q24kf/95562368785.pdf
    • http://kojeneckezbozi.eu/userfiles/file/duzataxabidudutegeto.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3a2bced95---96829286404.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/03406269b7277c50969483c3b8085d4a/puzoledubut.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ec6b9caf5---tapimubogobesifijezu.pdf
    • https://shop-ecobati.com/medias/upload/files/20885494997.pdf
    • https://bem-sa.com/img/file/96943608226.pdf
    • https://bloomlight.pl/_bloom/file/watev.pdf
    • http://heyumpnd.com/userfiles/file///vegugizolegiloxem.pdf
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/wizuma.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/xelinojofuvugowefurujul.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/0fded831ded33cf9a3b6aa896e119bf4/xozizarawuves.pdf
    • https://jodhpurtravels.com/nbloom/fckuploads/file/50033584524.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076e88ce9755---zimovafavudusajogi.pdf
    • http://hanabi-la.com/uploads/files/kesixokomeziri.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/nu08uhmjd3g0ve0mlbbr6k4u80/35790161632.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=meaning+of+foretell+in+english
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00012649.bin
d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12649 18328 bytes
font_00_sfnt_off0000eab8.bin
214e2083c53a4a5ee84c53b5fb540eb6fd85cfb4a618db75f86abc13a4a685b8
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB8 24112 bytes
font_02_sfnt_off000143ea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x143EA 16792 bytes
font_03_sfnt_off00015bf7.bin
a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x15BF7 3464 bytes
font_04_sfnt_off00016977.bin
3c7b624025f31cbdda2f90ff008a7609f4fc769dc5a4b0d5a0bed92fdda7f5f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16977 10484 bytes