Malicious PDF — malware analysis report

Static analysis result for SHA-256 8db4b859c60f9bb6…

MALICIOUS

PDF

71.5 KB Created: 2021-09-06 14:21:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 881e0f70c3e4897775216551103f187b SHA-1: 0f31ccb0d932a350ca52b2e3c6528324c4884e1b SHA-256: 8db4b859c60f9bb6eee4555e7524d40d5db680a56e721f625a807891f4bd61c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to other sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious document designed to lure users to potentially compromised or malicious web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=the+scientist+partitura+piano+facil+pdf PDF link annotation
    • http://www.anjhimayath.com/upload/file/menosaluzup.pdfIn PDF document text
    • http://edeins.com/userfiles/file/nuxutefe.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/76070129245.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/rarimopusegapigi.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/xidumatizatatone.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/62254571301.pdfIn PDF document text
    • http://daydala.com/userfiles/file/61102462487.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/c874f0c2413be59321742a84714aa430/kosurazute.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/50327620861.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/8d049c17cccfd134003eb4fa6e4f0ad5/40439659721.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/28929293968.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/909188c2f7c1bd886fc8880442e471bb/36091093093.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/6f0641bc5a5b03541a5ab6c9806fba22/97875662319.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/bogarub.pdfIn PDF document text
    • http://www.77ice.com/upload/files/luwalatenofawaran.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/lqgbtv9in0i3pesepjpo08n4sr/68045895325.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/179d9dc3704c6efee1607b7fc08cd7ed/45667868079.pdfIn PDF document text
    • http://fundraisingwebsites.com/clients/9/96/963d931f30a9d2280975e71a7f923c96/File/95895702970.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/sejenofajopudarajivumub.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9054d8396---mevanixiz.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/tawiteroloxewovegubijew.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9695c9aa4---18265586820.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/48451368348.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a9b196870---rikidedamokifon.pdfIn PDF document text
    • 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_off0000b4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D1 10780 bytes
SHA-256: 60a91d1e2c3904f50e201a7c1ef755851072f3d210219b924bca457f40418d80
font_01_sfnt_off0000cd90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD90 16016 bytes
SHA-256: be6ea5622a48d1d85b1719dbda722b78b11c42ad9bb5a57042f6f1b8126483d6
font_02_sfnt_off0000f629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF629 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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