Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc4f1a6bf7649533…

MALICIOUS

PDF

100.7 KB Created: 2021-06-25 21:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 242dec9f31dbeb407258d048fca79ac5 SHA-1: abcf52767d8af5865210e64a945034c53d6be32d SHA-256: dc4f1a6bf764953319752f8ee30d6a5a18be0ad61d926b9bdc4c460e2911aeca
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of an advance-fee scam. It contains numerous links to external websites, many of which appear to be part of link farms hosted on disposable or compromised domains, suggesting an attempt to distribute malicious content or phish for information. The document body was unreadable, but the heuristics strongly indicate a social engineering lure related to lotteries, prizes, or parcel deliveries.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://crewmak.ru/uplcv?utm_term=the+suffix+ary+means
    • http://adamlegal.com/userfiles/file/42486788409.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/phhb98qr89cnvmc5mknvuukqf4/43581515405.pdf
    • http://xn--49s538bo8ux8c.net/userfiles/file/8212040022.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16083510f220bf---joreluw.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7b90e56c7---sewedakakawos.pdf
    • https://sfeerweter.nl/userfiles/files/15114749040.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160998e912cafb---vilajuvosibojobinevim.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f29cd00cd---dabuwijepewexudasowasud.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac8439c445---53535844111.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc0c01b875---38058521061.pdf
    • https://brod-plovdiv.com/images/wosexuwadogevumonugu.pdf
    • http://straub-online.ch/userfiles/files/33418999757.pdf
    • http://mtecommerce.it/public/news/file/xeguv.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a31c3e19af---pagaselovevibi.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/5b64f559e6ae0fa0c8a71068abda63d0/zojujisijupetaparajab.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c2cb32b4ea1---37460234747.pdf
    • https://m-astar.com/UserFiles/files/75558244738.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160767e3d182f3---73080260930.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/d71c76e2a2efe1a7e1455c3c890e2ad3/siwowepigubogojotuvik.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bffcb36c56e---29602103261.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/5268e3e52acc02f1db5cf9f9b56c6183/gareropor.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920f918293a---roporijixefivu.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087803571fda---14899431784.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_off000123a4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x123A4 16792 bytes
font_01_sfnt_off00013bb6.bin
63a370deff19a82e4315ae21cb6d09339649929f10ac8e720f1b77b862bd73b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB6 19340 bytes
font_02_sfnt_off00016e36.bin
bae18c86bc64851cda8ce62237f0699cad7e7d12b1622560740a3d0f3f61bac3
pdf-font-stream PDF embedded font (sfnt) at offset 0x16E36 10492 bytes