Malicious PDF — malware analysis report

Static analysis result for SHA-256 e80ac3509906dde1…

MALICIOUS

PDF

74.0 KB Created: 2021-09-11 13:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 53a583ac7a218b746a307210bb7ccab9 SHA-1: cd34992137ad0e860de4f7502e73961e32fb01c9 SHA-256: e80ac3509906dde1ab9da2027f17c861e6bd29c09778d24a7dbd26098b49cda3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pixomot.ru/uplcv?utm_term=java+online+compiler+for+android
    • https://escaletravel.com/userfiles/files/larav.pdf
    • http://sanarina-coaching.de/ckfinder/userfiles/files/83823340510.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/bd866b720690ed52196a17e79e44615b/16660343897.pdf
    • https://baoholaodong24.com/userfiles/file/27465228950.pdf
    • http://nerezove-kuchyne.cz/UserFiles/File/64078458386.pdf
    • https://resicolor.com/upload/files/nakawosewezemevuvexe.pdf
    • http://sparkpro.lv/content/file/xodemakutokuvekud.pdf
    • http://rlmlaw.com/images/edit_images/file/84305171609.pdf
    • http://romengo.com/ckfinder/userfiles/files/39674234291.pdf
    • http://tongshengchem.com/ckfinder/userfiles/files/xowikom.pdf
    • https://cevhertemizlik.com/userfiles/files/zozanuxeditokorexadoviduv.pdf
    • http://kag.fr/userfiles/file/gurarakagakajexa.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/nao9jrhuuge6nbbcvl9972u5hk/9529550031.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/5515aca26f66c718730029ba9c3e7938/nudazesolojumawaju.pdf
    • https://cortemadera.com/wysiwygfiles/file/silutu.pdf
    • https://rajatotogroup2.com/contents/files/86817889272.pdf
    • http://sotel-perm.ru/site/file/samodezufuxakoge.pdf
    • http://shouce-image.kuchuancdn.com/Public/resource/files/semujixadajegaxotaj.pdf
    • http://transportdiverse.com/uploads/files/fekatixodarajozuf.pdf
    • http://hevolta.com/upload/file/71927681000.pdf
    • https://dalilak1.com/userfiles/file/65612704588.pdf
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/kewakejalewera.pdf
    • http://volker-issmer.de/userfiles/file/8307497307.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130c53ed516e---56161948408.pdf
    • https://pakianco.ir/data/image/uploads/news/files/78864422869.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb3c.bin
91586e030cf1e5b756f8f6174974219cc1a4c7a5d2d7f5b6342dd45dbc2e1371
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB3C 10572 bytes
font_01_sfnt_off0000d34c.bin
29aa64d94cc378eb83d19460fc7da1da4dad365d75ab56dc80598846351849a8
pdf-font-stream PDF embedded font (sfnt) at offset 0xD34C 17448 bytes
font_02_sfnt_off000100fd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x100FD 16792 bytes