Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1289f441ad35539…

MALICIOUS

PDF

91.7 KB Created: 2021-08-27 22:18:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9c7648f537d0b337f4337c04d416e560 SHA-1: 859e146aa838d88b96f7ac0e65df086f39ef7979 SHA-256: d1289f441ad35539f9708a64ea9532dc923ff8703e82e89b5c80ef5efae35712
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS platforms. The presence of 'utm_term' parameters suggests a phishing or spam campaign aimed at driving traffic to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://pixomot.ru/uplcv?utm_term=following+on+from+our+conversation PDF link annotation
    • https://bbpartner.cz/userfiles/file/memujugaperekadura.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/zobemuve.pdfIn PDF document text
    • http://asahiru-ban.com/files/files/13510401635.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/sonowaketobemijevowumunik.pdfIn PDF document text
    • http://husplaza.hu/editor_up/suxabizesexitobefagudox.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/522a20cd4bea03531c01290e0ea8c9c0/sinusidalajupiv.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/waraviwolumilurazagin.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/3b265ed2ce7cb10b270582ed567905c7/ribeponobidi.pdfIn PDF document text
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/lelek.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/vekozupekigixol.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/736954594f11b710fc36ee43e19be8fc/89879788093.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/boruwufowuk.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161180b82d7542---95291023891.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/bowugezuzabivoraza.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/14011200724.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a54016a4263---retesujalonetenobavoduluj.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/9e6f5364bfaef8eb5eed25f931441eac/32222782281.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a2ea299fc9---77581192084.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/85154635721.pdfIn PDF document text
    • http://jarosi.hu/files/file/kifamas.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160910c3c0e9cd---pupulesisapifafogulelon.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-7/file/rudagowekoxare.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/0fd7be4999112c2ad7406f7f7b9ff6a4/19272785150.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA54 25424 bytes
SHA-256: 2d648940a63690515272054ce1afd575f6153af9dbad09e140816da865d5cd37
font_01_sfnt_off000119b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CE 10908 bytes
SHA-256: 0c87a9e244fc3d783d4c0abfbc10f432d9d2b480c19a28187757c76e0e7a635f
font_03_sfnt_off00014b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B1E 16224 bytes
SHA-256: 64f0b6da39172dd4ee9c660e9e76f1d0ebbe60724ed3c05c35423f428b189fc8

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