Malicious PDF — malware analysis report

Static analysis result for SHA-256 5104d20dd67ecd42…

MALICIOUS

PDF

72.7 KB Created: 2021-09-06 23:37:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8da787a35f7650d7f63795507a89d60a SHA-1: ceffc9bccab51b7f04caca3426673c6a361f2d54 SHA-256: 5104d20dd67ecd42249927af4c4f24ede992217164f5bb4c22897c1d2c6173a1
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The heuristics indicate the document functions as a link farm, directing users to multiple potentially compromised or malicious websites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16096864092af2---88432466173.pdf In PDF document text
    • http://lucchetta.net/userfiles/files/75111147145.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/72283844239.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/049229d46b08883e4a5e3fedf66c79e7/pinufomadavuxodon.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/pelezunepuzovotalutigev.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b2e321d91fc---bowasizunasup.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/6934053934.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1627021945_650f844d38.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/98746741358.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/79341240024.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073ab82ac1ec---kavemamotilarefe.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/sijokunepovebinajevogig.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161117f72b5262---dexuvedizasejisis.pdfIn PDF document text
    • https://nadinerogger.ch/userfiles/files/46107100891.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781c61d47e9---21366268316.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/gunokagopoje.pdfIn PDF document text
    • http://lscapital.it/images/file/jogekul.pdfIn PDF document text
    • https://airbays.com/userfiles/file/37846212905.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e955791bc---zerabebebomiwerodal.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/81158959651.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/2rm0qllc59goemm94s9fhkpn7a/60143072957.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/56336845802.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=convert+pdf+to+html+open+source+c%23PDF 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_off0000b8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E4 16712 bytes
SHA-256: 5f90edf0b3d7b3473fa4b7406634ddea48224ad983d46352848560747df6e95e
font_01_sfnt_off0000e445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE445 10828 bytes
SHA-256: 845893a92473bf0773cb719dff53956b24b56a0372e994b3b1399b6d4ecc1177
font_02_sfnt_off0000fd23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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