Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bf8742fa160f4bb…

MALICIOUS

PDF

81.4 KB Created: 2021-09-20 11:11:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fdea76a25c00e090e6d790a4fd871948 SHA-1: 0a1da34a035f1387e176dc7cec5505b9a9dd0b8c SHA-256: 6bf8742fa160f4bb860da45d9061e14fe8cde345a3e2c8213a81423d2c250d6a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV also detecting it as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm or phishing lure. The embedded content is heavily obfuscated, but the presence of external URIs indicates an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/38e2b1abf7b852535f1fef7e41f0bb03/64134238646.pdf In PDF document text
    • https://tecnomatec.cl/upload/file/tawuxixanolakaza.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb0e0d1ed2---deneb.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145902b28fc5---rapese.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161346900d98d4---fikizem.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131b2bb51c8a---26601955666.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/xasidulozudax.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/17513849081.pdfIn PDF document text
    • http://itcbeautytrainingschool.com/userfiles/file/59509964495.pdfIn PDF document text
    • http://sieuthibds.net/images/files/91791516014.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/33537927178.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/61849262341.pdfIn PDF document text
    • http://carszana.com/image/upload/File/27029557218.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/13062830152.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/91524978238.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137c4f23ab89---9137558419.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/sisegitida.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/43814040620.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/3c08fd52e0c73100df2a639b3cfa605c/79402375435.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/76686939364.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/92328136987.pdfIn PDF document text
    • http://ruiqingchem.com/upload/files/91213141047.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/xifugobuma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=sniper+arena+mod+apk+unlimited+everythingPDF 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_off0000d613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD613 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE25 18500 bytes
SHA-256: 1a0126d930407d93fea2cf0e952542277179de7309736e0173fb979c4115ac91
font_02_sfnt_off00011e67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E67 11120 bytes
SHA-256: e747f0fd327ca73760915307e634e1aabe9940fbed7ebb08d1f9f7e618e199ca

Open this report in the interactive analyzer, or submit your own file for analysis.