Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f46d7979f444756…

MALICIOUS

PDF

79.9 KB Created: 2021-09-17 12:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: c20f6be8d81db5d9bd39123374c8f8e9 SHA-1: 334f6fdd6fb4b9021afae4baed30052a67d6404e SHA-256: 5f46d7979f4447565b01367cac96e3d6475b653f527e20ab5af62ea5a8a60cfa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. The embedded URLs suggest a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.sandipmallick.com/fckimages/file/ximelolalawopagojidaja.pdf In PDF document text
    • http://biomehl.com/images/content/files/49148078323.pdfIn PDF document text
    • http://yepuco.com/uploads/files/65741402375.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/favanaz.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/36468277689.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/rujodew.pdfIn PDF document text
    • http://konberdbio.com/upload/files/jikox.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/55745084594.pdfIn PDF document text
    • http://lex.tj/img/file/liviloxuvevo.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/ae1236a5e2db90dbf5420fa3bac30d66/84638751040.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/dabemipevofifugazaxuje.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/fe5ce0414b2d74d0ca7b8399d1f1d199/jigunimisapivonuxu.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/68727893401.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/zepamawo.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/kikifiruwadatomisuxu.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/161304a629fa3f---degekimuwenim.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/bitasusakix.pdfIn PDF document text
    • https://hung168.tw/UserFiles/files/34944149808.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/remurem.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/wuvitukikapifo.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/18615606212.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/21560224810.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/6022760108.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=360+mail+loginPDF 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_off0000d3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AE 18020 bytes
SHA-256: 7f5ded4e639f006f7af445c32d27bd789c1f55a95a8f5eec1c2327c65b016206
font_01_sfnt_off000102fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B15 10320 bytes
SHA-256: bac83b89aff15b97f78f22170379f8ecf99fa78ca45468437cdd05439431abba