Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8ad01c27102fbc9…

MALICIOUS

PDF

74.1 KB Created: 2021-09-18 10:12:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 4bc236247f4e4545b637560d34b0d78d SHA-1: 3a60950523a43b667b58c7c9661e336e89a855cd SHA-256: a8ad01c27102fbc9bca8b062889e8cd4f9996300e15de2f790a8ff99bcad1151
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the nature of the hosting indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcc387157e---45941837720.pdf In PDF document text
    • http://lustigersteirer.at/userfiles/file/gojijepisabovosiwil.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/5nka6v32803hvpp21383kh6pmh/10050299473.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/votemisopumamubok.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/sesekakubuzuxibuxujim.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/17908156883.pdfIn PDF document text
    • https://loctra.net/userfiles/file/81903001439.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/gimifaloguvila.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/vowiginagiwebepoxipif.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/6212873882.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373534e4b10---40838546613.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352fe0b353c---21329192415.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/43978875790.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210908022527431817mkvuk6.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/xeresekobodu.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/83821628778.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/xusaretekixasuvowepi.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/rifolevunenerawepixawor.pdfIn PDF document text
    • https://nurdagihaber.com/resimler/files/37516019648.pdfIn PDF document text
    • http://kammed.com/userfiles/file/13870164515.pdfIn PDF document text
    • http://xtra360.net/campannas/file/nipaxibapadeteda.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/34216402785.pdfIn PDF document text
    • http://casaperugia.fr/userfiles/file/40670361316.pdfIn PDF document text
    • http://aprt1day.ru/file/galilefebalowofaselupa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=wentworth+season+5+episode+1+onlinePDF 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_off0000c044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC044 16044 bytes
SHA-256: 7f0bf06f322a66bb8021ec1c6848846408cfc295bc2772d6765879ee634b1aa2
font_01_sfnt_off0000e9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D4 10756 bytes
SHA-256: 90609af4c9c1e9d20620d6b8fa6f4b09ae7db4f9defaa5802fda8f63c294c0a2