Malicious PDF — malware analysis report

Static analysis result for SHA-256 40082a040991e026…

MALICIOUS

PDF

94.1 KB Created: 2021-09-05 21:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 356fbe9e33fa6fe9c2eda03344889eba SHA-1: 9b410eb458b9046356c3adafdb405789000df7aa SHA-256: 40082a040991e026d8952cfb1c3349bf33e15da5adcf5173f33fd261db7c2f6d
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 pointing to compromised WordPress sites and other potentially disposable hosting, indicating a link farm or redirection scheme. The presence of an IP address literal in a URI further suggests malicious intent, likely to direct users to a controlled server.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://animalscipublisher.com/files/upfiles/file/20829771413.pdf In PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/e0bd519a8bf263fee8a9441d80204ae4/dewivadunobusolepej.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/574335308191c6cd85ab6e75782a6dc4/24311086435.pdfIn PDF document text
    • http://zzps.pl/userfiles/file/besokuviwefite.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/8147138021.pdfIn PDF document text
    • http://world-system-packet.com/userfiles/file/nufujobor.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/93145228961.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/43776266347.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a2dde446eaf---xemelave.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160848570122bf---nipuxi.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/16526457549.pdfIn PDF document text
    • http://rrarental.org/upload/file/ketafale.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/22156959742.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160b887ebc5508---jadanuvoni.pdfPDF link annotation
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161216e29921d3---tutepeximitok.pdfIn PDF document text
    • http://qdjshg.com/files/file/10963085826.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160e2d4fa42b7e---60140077915.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/0moabf9j1va2oc8hhrpmucf679/36481592053.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/90585962856.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782835a3796---3840385915.pdfIn PDF document text
    • http://zlato-stribro-investice.com/upload/files/79947255435.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/b9e507d5ace1f7af6383c6ac7a49ad2b/1117929411.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/c5b9c545db0439f9d936443f0aef6952/74641107425.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/gazutipafamiferowuv.pdfIn PDF document text
    • http://yuanda-boiler.com/d/files/83905442262.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=administration+des+affaires+cours+pdfPDF 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_off000105e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF7 10816 bytes
SHA-256: 18f329fa669d31f4a5254d33924004722d54aa07b907e1c47f51695a939d1be2
font_02_sfnt_off000136e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E4 20872 bytes
SHA-256: c7787c027cd04e12b853df71ea51f102b3c01d56d0bb41f6c0e0c074e1a9f15b