Malicious PDF — malware analysis report

Static analysis result for SHA-256 175d58337f47b790…

MALICIOUS

PDF

81.0 KB Created: 2021-09-07 03:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d5497df39c35fb93e0522db0258110c5 SHA-1: 87ab33435130aaf4b9beb1fb9becca9d58d5ae82 SHA-256: 175d58337f47b790ed79233018066ef4eb71966aaa61d80533ed522ae9916167
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggest a link farm designed to redirect users to malicious content. The PDF's structure and the presence of external URIs indicate it is likely used to distribute phishing lures or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://smidgel.ru/uplcv?utm_term=green+building+pdf+abstract PDF link annotation
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c78b12562a---49175528334.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/rofikikatubolepedoti.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160728d506e3e9---16885768277.pdfIn PDF document text
    • http://coffee33.ru/archive/file/wojonopuwe.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/6db43835f29711ab8e10574b9ad8c109/lobudibitimop.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b849fa28492---vewakinedirisurokawutigem.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca10a1da58---27480078949.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/kejosexedobimekelaragobi.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/kekesomorirunar.pdfIn PDF document text
    • https://diphong.com/uploads/memutaboka.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/54176196710.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/53454989739.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/zaforepivaxilo.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/46d1gmkhdu51lm0fi35a95ri5r/53992632282.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/bowedufupulumobofakawad.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/a3430708627ed98125ea955968c3c788/2726942564.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/25031279114.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/25917390546.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/n47u27s68n8361nal7csapeeo3/84896590124.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160975f692bbe8---81670963506.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/raxogekuwuxenevafemu.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b4ffa5892---weromawubizosugifonapijo.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_off0000da81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA81 16840 bytes
SHA-256: f084bac06008ee76bf17dd3dff40d2ca47aa4c4851cfc5245ddc901067bbd456
font_01_sfnt_off000105d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE9 10956 bytes
SHA-256: 1b9ef3eea2744abcfb6957e6787c5c14b9895027439892558217073db785f049

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