Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5ef254cd6efa33c…

MALICIOUS

PDF

80.6 KB Created: 2021-09-04 04:36:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 36649d99094671390b12a503c073aed2 SHA-1: 3f662b4aa2fb9044a0bad13e08b3762f02e71d36 SHA-256: d5ef254cd6efa33c3c6c540f34f84f7b4e9125bd6a209f4349440f8cd414f92c
176 Risk Score

Malware Insights

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

This PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of a 'Callback phishing phone lure' heuristic suggests the document may also be used in social engineering schemes. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://cructi.ru/uplcv?utm_term=accounting+for+management+control+pdf PDF link annotation
    • http://sevimticaret.net/userfiles/file/90576636351.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cf343b4bc---pogewokerelixozu.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/jomado.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/2ijte9pojjdrroh9dk33rq7fe7/xexiz.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841bf59ecbc---33139898486.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/noderidowedog.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/lasepu.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/pufavelolekasebefeg.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/d3387fd321a5ae5e69933da2848bf852/fujumoku.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/31273851452.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/346cd2b6bbaacb69ad679b706106d8f9/finewomipid.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/zobek.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/9652933779.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0540a533b6---77309408616.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/suwikuvubaloxekobukipeded.pdfIn PDF document text
    • https://hojoairport.com/images/file/6676084629.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/15012681295.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076dc9c8170d---59953316222.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-13/20210513111118354729.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/54112154891.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/kebupuvisuravimoxep.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/13751956192.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/63964268844.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/nokan.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/99389704997.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/5240d331724f677ab472cc66136c15ee/zudotofofate.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_off0000d9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C6 16608 bytes
SHA-256: 530321d1e972d7a83dcf4a750b49d354a28a3bdd57566368fa741765b5020460
font_01_sfnt_off0001039a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB1 10876 bytes
SHA-256: 9ad03473d3b399fae56ff17a4b6e6650d1b256db83ff97e8c7e2364a90eaf385

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