Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6d3ef372fa7b7fc…

MALICIOUS

PDF

81.5 KB Created: 2021-09-21 09:28:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1c980daffe1d55638f3b6256eb27ac89 SHA-1: 8ddea0d1e7c51ace36da022067bcf2324e7324c1 SHA-256: a6d3ef372fa7b7fcf1c41a3d964d54642f9386d9f2a4858b24b383e1333e6a24
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS upload storage, suggesting an attempt to distribute malicious content or manipulate search engine rankings. The presence of numerous external URIs and the nature of the hosting indicate a phishing or SEO spam attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://itracmediav5.com/ckfinder/userfiles/files/85885248875.pdf In PDF document text
    • https://emenu.hu/editor_up/16422923936.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/komosuzokizokagukiwepefer.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/64050909506.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef4f55589b---90904145773.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/30933560190.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161402bb2245c9---939276412.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/67359145383.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/xinodoruboxubafuni.pdfIn PDF document text
    • https://promise-land.com/upload/file/18652507772.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109160357306231.pdfIn PDF document text
    • http://doanhnhangiaophanvinh.com/images/files/64866158346.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/bitavegal.pdfIn PDF document text
    • http://leguido.net/files/28050179052.pdfIn PDF document text
    • https://t2sc.me/userfiles/66476203747.pdfIn PDF document text
    • http://whdhgs.com/uploads/file/20210905002416831.pdfIn PDF document text
    • http://garankuccu.com/upload/fckimagesfile/59e37132597510b840471d09301bd785.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/68971022474.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161484e8d69425---xolonepagezanizadojas.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/14302922998.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/xidusaxigorosaviko.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/89610700072.pdfIn PDF document text
    • http://barefoot.pl/userfiles/file/tatemurod.pdfIn PDF document text
    • https://ribaczpeter.hu/files/file/fumalebelo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=watch+dragon+ball+z+online+freePDF 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_off0000d9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C2 10780 bytes
SHA-256: b08ccb09a42f1d4da217d3a02e702a1774099f67419a21e65638b89a5dd15b6e
font_01_sfnt_off0000f259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF259 17904 bytes
SHA-256: 485634d574b34dc74a3a19c677fa2f6930e64cc8fabeb34e8d5bd75cff2dde12
font_02_sfnt_off00012084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12084 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1