Malicious PDF — malware analysis report

Static analysis result for SHA-256 4973e5e15ae85482…

MALICIOUS

PDF

84.7 KB Created: 2021-06-26 13:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 02a0046e466d1a0efad0a338907e0b68 SHA-1: b17b9e6e2bdb44b5e49b20d5f2aba8c8b83151e9 SHA-256: 4973e5e15ae854821c3f810018fb095c2270c51c5b00339e17d790c5a5b58eda
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to compromised WordPress upload directories, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs point to various domains, many of which are associated with compromised CMS installations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16075bdace806d---89284974376.pdf In PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c1d2831da---38215974359.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a38a621c029---75459407241.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/47985c5e0bf93a913dc3a5ee8006aada/genufotunonerudebelunum.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16078ebfa06d6a---jozoxidirovigawi.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/d55ddc6fbfd6e387ff7323ac11f46507/63061678953.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/7ib5kgg7p0qrn7frm0hg6dhqfi/55552137383.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/2aacd5fd43f0c16604d73c918a983c6c/82757211457.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746532b9c71---bamobizu.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/42450145d392d41eb9645abb4a08397b/japenarodeponesebo.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/7eea0ca5f18d8fc24d59f445ac2de0ca/78155745384.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/pifagajexopuri.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/58571165616.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/h06bqfe9ntgonr6rpjcgl979ag/19420863218.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/zejutisinugabavebawosolu.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf4fba7a70---wasusa.pdfIn PDF document text
    • http://4bx.pl/public/file/20476636784.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/nv3in9ehgv8ro8hfafalhuauu1/80799805405.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/847c9e8898e1319ccc207802fa29a19c/fuboxomunonor.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/2b35a4025f1045eb015cbf98e851bd03/gujobipenezawexixe.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607972b4c7e19---gosofo.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/57967899329.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/85533886920.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/96987140093.pdfIn PDF document text
    • https://susta.vn/userfiles/file/93394294285.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850a7cc47b0---10702302804.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=cross+connection+trainingPDF 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_off0000e701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE701 10388 bytes
SHA-256: f8444d566a58ec2d32168fcb2ac989c844953b79fc6845d3dd49a51dbfaa8e76
font_01_sfnt_off0000feae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAE 17804 bytes
SHA-256: 09cff441d07e9814aef2cf4b2d780d2077499b367a37b9ce09370240671d7490
font_02_sfnt_off00012d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1