Malicious PDF — malware analysis report

Static analysis result for SHA-256 76f4060f0b72de78…

MALICIOUS

PDF

80.5 KB Created: 2021-07-12 17:29:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 027f22306ae149f0bd09026b31587d16 SHA-1: 3c2855b12c3dfdb14bcb9434dfb7eba96f1fc3ed SHA-256: 76f4060f0b72de7865007e52ca21a4bf175a1ceef1f7e2255c1a542ab9b2eb2a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely 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 0.9953

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://sosonomo.com/ckfinder/userfiles/files/tibigeluzifatukid.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160986a828e515---zepopugosepe.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc8ffc42f74---39984423820.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609e098b177cb---53086498635.pdf
    • https://myvideoclasses.com/ci/userfiles/files/kitowifutopavamewaza.pdf
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/0e5490c16f6545cdcecb7c25c6f8c48f/81928182153.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/3c583e7265bb206acbc74617b1b9d789/nulasezilef.pdf
    • http://alphasigmaoverseas.com/userfiles/file/pifuzoduwakimesat.pdf
    • http://aisef.org/uploads/userfiles/file/file/62474893544.pdf
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/f4a14af591dfaae308c69744063d5daa/mobekudozojo.pdf
    • https://asiquim.com/ckfinder/userfiles/files/81936679053.pdf
    • http://busankid.com/webfiles/board/file///xigovuvoxarojo.pdf
    • https://kltccompany.com/ckfinder/userfiles/files/37845311875.pdf
    • https://actor-conseil.com/files/file/49182275226.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160902ae4efc91---89838418662.pdf
    • http://dolphinegypt.net/userfiles/file/sobakowuvozedutif.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864fb62faf4---90522203142.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/e70766d3551d4382d525839f78518067/viwadu.pdf
    • http://bestpokeya.com/uploads/files/susonukadudije.pdf
    • https://ecoretras.com/file/josiporeveravokisuxujatoj.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/mp1a8sn5t70jm5rm2dr4kr13oi/nivuvagapezutotuwopuwelen.pdf
    • http://klefmarken.se/upload/file/jetefope.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16087efc1be2b3---mutel.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/56f31c7eec5746415ef36d70e99e57c1/lakanosugufazom.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=kinetics+and+equilibrium+test+answers
    • 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_off0000d6e2.bin
7ffc33f34dfb51dbf9a6bfa8ebe7a41ff72460e55a0a1e3bbc6fd717498980bd
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E2 17084 bytes
font_01_sfnt_off000103ab.bin
98f01c7b477a2cef1b451d92cbb8f6db43041d57cdbe385851eda1938ba3b2dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x103AB 10876 bytes
font_02_sfnt_off00011ca0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA0 16792 bytes