Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2d4eff018a88769…

MALICIOUS

PDF

77.7 KB Created: 2021-09-17 07:17:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1f4145ecd62058788309c493cb2fa699 SHA-1: a6ac3f060f694a855a4b1f8668f56adca172c28a SHA-256: d2d4eff018a88769d077936cfe83ccec594182ef9837dffd73a9771dafb74e38
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with one URL pointing to a compromised WordPress upload. The presence of a 'download button' lure further supports a phishing or social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gidromall.ru/img/uploads/file/vubujaj.pdf In PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/bidobilamiwa.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/xugeb.pdfIn PDF document text
    • http://iwayman.com/uploadfiles/file/2109061320053779058tnfm3.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/59384485032.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/707d829284300becc3c0b7f6e9aaa6a8/gupilijutunutifenozobus.pdfIn PDF document text
    • https://krainaogrodow.eu/zdjecia/fck/file/xepexizem.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/55072948561.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/a4b6244cb923df922cbc69dac1e86cc5/tudode.pdfIn PDF document text
    • http://parentini.it/userfiles/files/94186530354.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/sajuduvoxogifikosi.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/gavadedojuk.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/69572727171.pdfIn PDF document text
    • http://kmjmt.com/news/upload/file/210905025822523549kj1ass.pdfIn PDF document text
    • http://irollee.com/userfiles/file/rodiv.pdfIn PDF document text
    • http://iwayman.com/uploadfiles/file/210911054619198838k16de7.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/98963474153.pdfIn PDF document text
    • http://askaudit.ru/price/71192449534.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143cd956809c---51470709120.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/pizopoxaroxasaruvozerewab.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/37080618892.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/f6cce821cd9e187e95ae03a87b1c52c6/turorejalibixabekil.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/zikelu.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/23409684730.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/jojudixaduselagumali.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=programing+hero+apkPDF 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_off0000ca10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA10 10480 bytes
SHA-256: e32d057ddaad27c7717af2fdaa72b02c605946f466d67da3325b55c0cb667b7c
font_01_sfnt_off0000e19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B0 18392 bytes
SHA-256: 49ab154a84a2595945ad8d8d6a4dd802710ea404dbe77e55585ec03ceb5938fd