Malicious PDF — malware analysis report

Static analysis result for SHA-256 419a38e422009086…

MALICIOUS

PDF

72.2 KB Created: 2021-09-24 10:24:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b26d45c7db38de347ce464236e405253 SHA-1: c14248e59f314e5c86f9a8f72b63bc79053afb8a SHA-256: 419a38e422009086abf6224c00146590a14cb957fbbc4e3915d31a0a4e1f6e5d
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms, with several pointing to compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what is inferred from the heuristics and URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://pistant.ru/uplcv?utm_term=download+film+a+man+and+a+woman+bluray PDF link annotation
    • http://jlm-kg.com/uploads/file/91363211779.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/rixovuk.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/lazuwadezale.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/jci4mnu5re7k00lj0n6st0hvou/xoposelaxozeveziwifasone.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/wateruziwokamoxefifaware.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/3314326710.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c39d849f94---pumorixolepogafifivek.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/dizasifor.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/zamozodofazitavaz.pdfIn PDF document text
    • http://contactfm.be/userfiles/files/delesaxevopefojupekijit.pdfIn PDF document text
    • http://orlickachata.cz/files/files/62311834218.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210909_FA3976E455E1C722.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/11276c0b19724b9fa84af69690b391ea/69632323567.pdfIn PDF document text
    • https://premiersuli.hu/files/files/lonorasutixitef.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/dulobudete.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/kefakuxubisizelububekod.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/54513076902.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab19e72397---900832714.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/gukotuzijarikolaw.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/tatofekoma.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109120404103218.pdfIn PDF document text
    • http://erex.hu/upload/file/79548886079.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_off0000b5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A6 10560 bytes
SHA-256: bda3a3a6cd5959af80fa631e899438dacc4d1fe5ca808c1642c5a48a5916ef2b
font_01_sfnt_off0000cdab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BD 17448 bytes
SHA-256: 732f9b09375d5c33917b008c7c8eaf1c3607c6ffe038b8b40982a4b7fb12e35f