Malicious PDF — malware analysis report

Static analysis result for SHA-256 e197a4b551dd2ed1…

MALICIOUS

PDF

92.7 KB Created: 2021-09-07 19:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b92b20ae21fe1df86fb0dccc166b00b2 SHA-1: b5a9cb3e2eb1be74a5f3a03523b5701d25fd18a4 SHA-256: e197a4b551dd2ed110c152d4ad39fcd9ab030320d31319fc1ce615d7edfdfbc8
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://fluffy-chins.com/images/file/parolawukuxemaniturufaw.pdf
    • http://ueros.fr/admin/ckfinder/userfiles/files/difurapenaluv.pdf
    • http://centrons.com/uploaded/file/181565825060cbc2a0c39e2.pdf
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/kukoze.pdf
    • https://eklyps.net/images/file/sevobegitup.pdf
    • http://hajni.pl/userfiles/file/wuvudemudave.pdf
    • http://seednseed.com/admin/fckfiles/file/xotomubejelotakum.pdf
    • http://huichem.com/ckfinder/userfiles/files/bativi.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160add365746b2---80422738696.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bdaaff16cbc---87994374542.pdf
    • http://tunesistudio.eu/userfiles/files/14290146255.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/57635ea53ad557b88f328047dd029e74/sitifudelavixuxasibu.pdf
    • http://newcityhk.com/userfiles/52647252974.pdf
    • https://hkbca.org/UploadFiles/file/20210718084812136.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c77e40611b7---72356114461.pdf
    • http://ainut.fi/userfiles/file/bedazifeg.pdf
    • http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/92720846714.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607206adb2404---46939527309.pdf
    • http://essiac.cz/UserFiles/file/81872771096.pdf
    • http://studiotecnicobonoli.com/userfiles/files/58630406710.pdf
    • https://nada70.org/userfiles/file/93478375160.pdf
    • http://zwickerfoto.hu/_user/file/wuxofibejimubibikuk.pdf
    • https://tractorpulling-emmeloord.nl/upload/file/627865172.pdf
    • https://ofertaromania.ro/ckfinder/userfiles/files/97841166531.pdf
    • https://forexinc.ca/upload/editor/file/89889129540.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16118fba69a68d---fizekoboziz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=acer+chromebook+15+service+manual
    • 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_off00010337.bin
9b4c13af0aaa26398059019b1decb7674e9a7be582d0a45f6d423a0a68dfca98
pdf-font-stream PDF embedded font (sfnt) at offset 0x10337 10964 bytes
font_01_sfnt_off00011c8e.bin
5b7170825147f5f806c9d4401e06fddd8e3b4a882996ce6bb5fe25a31e130b86
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8E 18832 bytes
font_02_sfnt_off00014d81.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14D81 16792 bytes