Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aabd3d468655b4f…

MALICIOUS

PDF

93.1 KB Created: 2021-07-03 05:44:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0998a101b38825049bf95bc7f846f5bb SHA-1: 9ac4ae9113610b8cea25ed9c23d7a243385140fa SHA-256: 1aabd3d468655b4f7a0defbb5edea4036670d35ab9c5b73e3ac3d05ad4daccfd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm with numerous URLs pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the link farm and the compromised CMS uploads suggest it is designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://oniceh.ru/uplcv?utm_term=frequency+verbs+english
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/fbd17c923ccee816253518473e919d9a/simeradanive.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/5p1ghnere3cr4rsh6fq22vnjn4/rovadanelejekabolasuf.pdf
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/9404ca2f7d99f23a1cf223982c4cc91b/kimovabifelagurinudo.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa386cd716---juninazul.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d99c9fabb---84113415756.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/e93jp7ack9od48i1mkej2u6cq2/10032192943.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608687ad024a9---55749716870.pdf
    • http://szkolka-wiercioch.pl/files/file/77778646750.pdf
    • http://caigeshi.com/uploadfile/file/2021062216143573499.pdf
    • https://bamor.org/userfiles/file/56087484179.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/abcj2f4dqe2rlhmfn17p2q05m7/wabewixikawebetogosa.pdf
    • http://frangarcia.eu/upload/file/fepusotufobisupegikelav.pdf
    • https://augsburger-dartliga.de/uploads/file/sevaxoxa.pdf
    • https://whiteplacard.com/UserFiles/file/gapodutebefamimez.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/7dc6d746aebd5751680fa628f64d5589/buzikewiwuxewaniruvo.pdf
    • http://arslanemlak.come/file/94407827270.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/3b566b89738c7e00dccb4283c803c062/voduborotevuwotolomoxilem.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/0aa0231823d90a72b9619a36364eb59d/xitamunatajuzuretalutu.pdf
    • https://dgaspcsm.ro/ckfinder/userfiles/files/pedimo.pdf
    • http://akcjonariusz.com/UserFiles/file/sumawuf.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073bed990350---lofinejorupaser.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c919beb028a---vaxon.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607bae8df1bae---romagaj.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f180.bin
a31e141fb2917ac6221449cb8c95e700680d048453672ad8ad57cd6853c5c53b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF180 16108 bytes
font_01_sfnt_off000106ab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x106AB 16792 bytes
font_02_sfnt_off00011ec2.bin
270cbc81eb045d8f129fd410d1145d04a2085115f61ddfd8871ed7c8b9e87053
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC2 10672 bytes
font_03_sfnt_off000136c8.bin
9057d4b6c08bd6c903f24650ab4389ce1148b291b27d0ef1987cfdfffd13a1a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x136C8 17988 bytes