Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8bb982b7a162d77…

MALICIOUS

PDF

86.1 KB Created: 2021-08-20 08:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 21ab75a2aa7ee117d3acbdcf7a82c39d SHA-1: 242f343f2c0247e73ac283ccc87c62211c73db73 SHA-256: a8bb982b7a162d7749d3bddc1e6d3bd3dffd17c2127f4c6a9097d749307c4c24
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to other PDF files, many hosted on compromised WordPress sites or disposable domains. This suggests an attempt to lure users to malicious content or potentially for SEO poisoning.

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 https://prawobrzeze.info/userfiles/file/liruxizitix.pdf In PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/9336063847.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/81557676692.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/38225140153.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a21179f403---wipafaza.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/d5602b44ea8d03407742f9cd457e247c/lomomagifofu.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079300db60b5---26750389950.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/33s4odfo34kghe9eksji65vet2/pefewudusixalaza.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/91788d8c05639c05a03f8f0e347f02f1/kewanurugosudut.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/ralusosapew.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089242cbb321---42218847639.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1ac0a4e07---xatomow.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7f7b95f7c---66341841456.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/87395341916.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/kebavivebodob.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/42997804509.pdfIn PDF document text
    • http://lphs-the60s.com/clients/5/5a/5a84a5cabe7f31a06b4bf99f7e1b7ad6/File/32611054536.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/9753976118.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a03c6ab11bc---98073735796.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/49180256015.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/96230564932.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/jaxume.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=skins+de+slendytubbies+3+zeoworksPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD353 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB64 16412 bytes
SHA-256: 0188987eec4daec3a9433034af94edb3cd859e98175e12e953c535390f120aad
font_02_sfnt_off000101aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AA 10916 bytes
SHA-256: f22a0353dbc7a25d96b0b515bbcd975e4c917ed0c6ce774994a67f3c27c627fe
font_03_sfnt_off00011b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B24 17724 bytes
SHA-256: 47a966b9e394d8ec674f3e95777b54aff2241d19b23290fcb682ff78d9d71524

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