Malicious PDF — malware analysis report

Static analysis result for SHA-256 331c7615aca58f4b…

MALICIOUS

PDF

81.0 KB Created: 2021-09-01 10:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9786fa288febee62ff355aca84e0add9 SHA-1: 1e93c258bf41ba613637dc7b23e59fb5ddbdd22c SHA-256: 331c7615aca58f4b26a9ca132490da9eefdbcebdc10107dad5feec63c3d659c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to numerous compromised WordPress sites hosted on disposable domains. These links likely serve as lures for phishing attacks or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/44tp6miejf3878nmqucse4ufr6/jemiloxopuxuta.pdf In PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/ntbr22tenr4q82kohfdsc5ud3j/dovevafutega.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/4c2fe247002e3a1a17aab30ff88f5751/sezerepuboniziriru.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/zuvup.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cad9a0c6dde---32267488438.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609879060ba97---zexudivejofulavijok.pdfIn PDF document text
    • https://steammining.com/userfiles/file/lebonon.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/8tsup5drv44br6cim9g59hgto7/15288929876.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1cc3b4d7f---61558763699.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/61995352902.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/sizederovejugotaroga.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/a515caa9aa31a9d8edadf209650cf9bd/9490690836.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/rojafugenuwugute.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/93730627366.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/og5cujoqja2klvehb0ht19dgv0/36503074465.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/nolulisejifixujumer.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0a6dd6485---18358495266.pdfIn PDF document text
    • https://kis-u.com/page_data/file/20210529110109.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160870f36a6ee9---79274422239.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/gusiwuzidumonomopoxafux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=east+south+west+north+mapPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD587 10548 bytes
SHA-256: da117f82ef0faeddd7c9d11cbfab99833333ea5090ae99f2cdcd2e21a1eb8038
font_01_sfnt_off0000ed75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED75 18308 bytes
SHA-256: f1e464052a531d463a717204642f937e8f34ede941b07ccc4e1cda80e8370629
font_02_sfnt_off00011cfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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