Malicious PDF — malware analysis report

Static analysis result for SHA-256 13b99b4c406989d8…

MALICIOUS

PDF

82.6 KB Created: 2021-09-18 21:07:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ed08bc1fe6daee3e1d6c329077b76c47 SHA-1: c9f2a806b4767f4fbd21f1c1378e6307e059c36a SHA-256: 13b99b4c406989d8e9ccec1d6b370012d5c341833ecdd819d2fed0fa8e7f5a35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to external websites, many of which are hosted on compromised CMS platforms or disposable domains. These links are likely used to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://drafthe.ru/uplcv?utm_term=mi+box+tips PDF link annotation
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/65811914993.pdfIn PDF document text
    • https://tenhucchi.com/upload/files/dimajimowi.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/39901757302.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/53207add829b2bdeb428065847b7b216/65184477582.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/5338683480.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210914111237320799387.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131abc28e7b6---97257739642.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/sotitolaxene.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/2uop5pit4uhlmb0cvbhhlsp9q5/79102805490.pdfIn PDF document text
    • https://basisangka.com/contents/files/jajexotojitalomatemeza.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/9762971074.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/8acb09d635cbae89060341f4512ecfa9/buroladoviveguzimoz.pdfIn PDF document text
    • http://deauville.ru/files/file/51662983170.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/buxasadaduvefukasa.pdfIn PDF document text
    • http://hidramaco.com/files/files/gajilojunovoxupizemem.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/88833436460.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/65815855855.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161339e0835dcb---xowiwulefog.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/lilazupo.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/16521679214.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/10872626898.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/gazoxakake.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/98448208774.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/vagilemeketuvo.pdfIn PDF document text
    • http://steinemann-ag.ru/wuxexakas.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334f921659b---roxopozetetabenipovopefab.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_off0000deac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAC 9936 bytes
SHA-256: 43a44ca128c5db5e056ffcf79c40a0b97193496bfbfa7c03f857cc123444aa47
font_01_sfnt_off0000f48b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48B 18832 bytes
SHA-256: f183db1ad717221de8f3c8965e7caac949217cc6128fd6860b62cb449eeacb72
font_02_sfnt_off000124b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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