Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fcf6495fe9cbacc…

MALICIOUS

PDF

89.4 KB Created: 2021-07-05 11:01:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 18ec9f43ac6f1c7c2cd7f00ac6a48653 SHA-1: d25765719896b2bfb87c0d74b3ac99dc4aa3e3c3 SHA-256: 2fcf6495fe9cbacc93dec77405728f5d1e6e28d0c07aa58126efd42a802bf51d
176 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or redirection mechanism. One URL points directly to an IP address, indicating a potential attempt to bypass domain reputation checks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/893a234d1b206ce693fcb96f89238c2c/83195672933.pdf In PDF document text
    • http://vattucongtrinh.com/userfiles/file/29512511080.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e70b087820---sixufosepogatalejigosit.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160747d12d70b5---29942360344.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/i3r2dmagkckgdp7kefbh58afd4/14299192296.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/giwefosevoludojuzigup.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2bfa1b655---77214652119.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/5e2e835fa417c9578b9b434087101ce5/16588596853.pdfIn PDF document text
    • https://dintek.eu/uploads/file/wuwenedezurulabesinefab.pdfIn PDF document text
    • https://soechi.com/userfiles/file/bimej.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-4/20210604235300346019.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/liwodino.pdfPDF link annotation
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/9650d032cf18b40417e6e8f4c21d5e9b/11637240648.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/a99631e32a05233e1cf88fb846178e8a/49730194160.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087bd717bb5d---toviwuzibum.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1286c8b28---kokupowu.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c8eadcb2ef3---bozapilesude.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/bvlcmbgoualef4mqjnrrnl7hd5/86772520811.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607301f53c912---2185298938.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e38c71e086---tarazazive.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/588d286c5607874fcc5d6fdb77aea41c/48355147944.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160772abebcd65---43967902817.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0c1a1a457---mivikapipumizumav.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b10c15c9f0---58464092247.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/fc8c83bfdcdb230f4968a014b9bd38fc/bijivexiwule.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=c%2B%2B+mcq+online+test+with+answersPDF link annotation
    • 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_off0000fa82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11299 10756 bytes
SHA-256: c1c8e2116295f528af3207ce5e0222d1a6cd21ea3ffef9c1cca77a584b4a9532
font_02_sfnt_off00012b2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2D 17156 bytes
SHA-256: 49fb5d0db5972706f404f8d243f1e61163adef6f991783fac51bcb97e4c64506

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