Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bf5b4c34ede3c22…

MALICIOUS

PDF

84.6 KB Created: 2021-09-04 07:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 87a285a3b3fdb081cf4b3170bcbc5a6a SHA-1: 692a0dd3e8a9fa50c5e28b5e823ba8761d551999 SHA-256: 1bf5b4c34ede3c22463cd0970147bdb681b11762d92b5e9ea6a026b304770209
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. The file contains a large number of external URIs, many hosted on compromised WordPress sites and disposable domains, which are characteristic of link farms used to distribute malicious content or phish for credentials. The presence of numerous links suggests an attempt to obscure the ultimate destination or to leverage multiple attack vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ketchas.ru/uplcv?utm_term=hp+z2+mini+g3+workstation+manual PDF link annotation
    • http://elma1.ru/!upload/files/43196169578.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6b4788961---14473627563.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/rij2t672p2ts1p94ddo1hjh1d6/rakumozatelefitotidopu.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/xuvujivopuxegalolepuxo.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16229281831766121655.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/9c1576b925366b2c6a97cb37bbeb8867/zodixojaraverezelodiba.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a7a508572---884860419.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/gaq6s4u2sc47pn0atofp82mu87/kusimuzigejobatez.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/bezedokan.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/14355040247.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/bb7949f0aef6ec02089221f8ef8aa6e4/57343995065.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/95120453821.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/77931594564.pdfIn PDF document text
    • http://rc-modeller.se/images/file///somipovid.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/19207b7e5834f49fb13d0d518cd415b3/xofovo.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/1414873008.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/bezezanefazeserawusabip.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/9e04a64b9b133cdb4a4d565652da0f72/91922954122.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/c1f7ed7c0c0f3c6881b791f2039fff93/26043493434.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b998131312---vazorojudevesiwiwedosapef.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1610f1af4c3159---meziduvilisasen.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/55618028497.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/zimoxopi.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/wanoderes.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/fubumajixonifumutenere.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE59 11084 bytes
SHA-256: 7cf5dee4687ad2a270d5b2f0cc502a217931a80465bf87c4a5bbdb41f383f8a1
font_01_sfnt_off0000f841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF841 20296 bytes
SHA-256: ecf9aa133c76c475dc2fe0291fdd7e367d81d5093947f7a96729c56eb1dc6fff
font_02_sfnt_off00012cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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