Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e6cb808cafba720…

MALICIOUS

PDF

83.7 KB Created: 2021-09-13 23:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 12d2e45e4f0fbc41eb9cacf537f42d42 SHA-1: 81c1a40cc65892372c7a27b1c4cb3dbf1ec0a08e SHA-256: 8e6cb808cafba72097c05f03a2058f74962bb90182c3bf35bfae22d8cdf5cac6
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://studiogaleazzo.eu/userfiles/files/fegutu.pdf
    • http://casaledellasignora.it/userfiles/files/95805590278.pdf
    • http://kleinschadenexpert.de/userfiles/file/miruxelenovumonapuvovoz.pdf
    • http://asijskepotraviny.cz/files/file/14744637336.pdf
    • https://12shio2.com/contents/files/99767743354.pdf
    • https://cmoretv.com/userfiles/zuvesepela.pdf
    • https://yarpaket.ru/userfiles/file/bifotugejolewisegip.pdf
    • http://pol2-simf.ru/userfiles/file/xiziniwudinonoradutelebi.pdf
    • http://solemarservizi.it/userfiles/files/19511965353.pdf
    • http://cerrutistudio.eu/userfiles/files/33564633493.pdf
    • http://pensionpoint.cz/userfiles/files/xonoku.pdf
    • http://ledseoul.com/userData/board/file/xidefewawa.pdf
    • https://akproauto.com/nbloom/fckuploads/file/segoluvakobitizas.pdf
    • https://daaeportrett.no/upload/file/paleliw.pdf
    • http://batiment-tunisie.com/userfiles/file/mekipabuxuxobepo.pdf
    • http://mertcelikkapi.com/userfiles/file/32523549303.pdf
    • http://tulga.ru/editor/files/71524702584.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f37114ed9f---34198682953.pdf
    • https://cmflower-kkc.com/ckfinder/userfiles/files/96446578829.pdf
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/74987120275.pdf
    • http://thecargonepal.com/userfiles/file/kepemudore.pdf
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/xejexogikasi.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/52ea45b195bde72518bfc2f9108e2e06/88884584083.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1613312c9b85c5---68492214992.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=frig%C3%B6ra+lagringsutrymme+android
    • 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_off0000e282.bin
f2141c8ad7520d9fb0fb33bcb163a257c16637d843a0ea9b3e9f702c6577d615
pdf-font-stream PDF embedded font (sfnt) at offset 0xE282 10996 bytes
font_01_sfnt_off0000fb7c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7C 16792 bytes
font_02_sfnt_off0001138e.bin
52a37d3f8b9a7857e4e63d7c185b8766073ca834dbd340ef0cd9abd6bf5e2494
pdf-font-stream PDF embedded font (sfnt) at offset 0x1138E 17488 bytes