Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c09fe7cae341a90…

MALICIOUS

PDF

88.4 KB Created: 2021-09-15 10:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3bc6a9c45d15b18419e69c2f99416c89 SHA-1: 7a69667dc4f4a7050e71f2c438aba1fdfabd9c5f SHA-256: 3c09fe7cae341a90ba6836a42afcc8e7c235f8410f539dfb87b71c54dfcc8207
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of embedded URLs, many pointing to compromised websites or disposable domains, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of external URIs and link farms indicates an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://irlanc.ru/uplcv?utm_term=rpg+android+porn+games PDF link annotation
    • http://chupanhnoithat.vn/upload/files/dimij.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/bdd07cc3438adbad1418a5e32953c9ce/vupuxefejexa.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/81079535640.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/27224514286.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///97543899156.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb02ec3ed3---88110402276.pdfIn PDF document text
    • http://osayit.com/images/file/63563826460.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/72770398023.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a4553656a---botobiwurigabelaxonof.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/69156272596.pdfIn PDF document text
    • http://thedreams.cz/files/47009048047.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/zakogujipukifajoresoj.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/52908195654.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/musadukibagagozul.pdfIn PDF document text
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/xonobijuvibonojabub.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/zudajasetusakorufaxi.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d69441a014---38140138363.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/demufafepawirepijamebe.pdfIn PDF document text
    • https://akemi.ro/hirek/file/babevejabotigiwidog.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131a4be165d9---29982255416.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/97808669314.pdfIn PDF document text
    • http://didula.com/img/file/91829246782.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/nasolotegobiwovapik.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/22812128788.pdfIn PDF document text
    • 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_off0000f824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF824 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11036 16904 bytes
SHA-256: 80dfdd1adfd32278a548666680ff64cf33c05669b3d59a87ff94570bb3139994
font_02_sfnt_off00013c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C26 10636 bytes
SHA-256: 925da1adfac4df04d46f50501dadfb68ef7cef6c2d68be270784ce1b313a8e6b

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