Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b13d8e7f67ae232…

MALICIOUS

PDF

83.0 KB Created: 2021-09-03 11:33:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: da4391ba3ff62b10f3facb24243030f1 SHA-1: 6f9a1fd6c7dd08efa9f585fa348135a8386d45b8 SHA-256: 8b13d8e7f67ae232453f26ad516849ca46f9ebcabf82fc27f5a6ac76a3dcb5bc
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The presence of these links indicates an attempt to direct users to external, potentially malicious, content.

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://philabc.ru/uplcv?utm_term=nektar+panorama+p1+manual
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5763c75c72---85175674066.pdf
    • http://vankouwenenmastop.nl/UserFiles/file/83278382649.pdf
    • http://ulv-fogger.es/d/files/tabojejuretejo.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161236005b7df5---bibosar.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160c23fcb2429b---54058391836.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/ad991db45a09d4fd2804134d09763212/58350680951.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610053baf015a---fowogidogifurozivoremo.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b64b5122837---83764816460.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/8ee681d440c1c559a8657a34ee6cbaa4/39740328335.pdf
    • http://kiiga.ru/userfiles/file/susexevegaz.pdf
    • https://produktybhp.pl/pliki_user/File/tikotege.pdf
    • http://aucoindeshalles.fr/menu/file/fajusikazerunonuxekekesu.pdf
    • http://toyotarent.kr/FileData/ckfinder/files/20210623_8CAD57242C8A2B66.pdf
    • https://kurtoglumob.com/upload/file/69972537416.pdf
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/257558152e9f96cb17991254fddf95fb/tefejev.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161143044cf971---37509030564.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160ade3a0b9eb8---bixuj.pdf
    • http://teplorium.su/userfiles/file/51262836108.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a8a7706a6---sapuk.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d49f1f248---rubuwuvebafomejurix.pdf
    • http://xlsferrosilicon.com/d/files/goveraxoxujolunamete.pdf
    • http://axi-hohenstein.de/userfiles/file/lazopunetifet.pdf
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/70412703553.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16089a86e92f9b---45173414104.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfaa.bin
720170f2d77285a6249c2a14d795af8a8ad40ee41511125ad8bdf939adea52ab
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAA 18224 bytes
font_01_sfnt_off00010edf.bin
8bd38bd9a4fb6eb91b29138e118a007f968f759b76a4b3269f78ad2c2c21efbe
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDF 10372 bytes
font_02_sfnt_off0001265a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1265A 16792 bytes