Malicious PDF — malware analysis report

Static analysis result for SHA-256 4370e7e087d9db0d…

MALICIOUS

PDF

76.9 KB Created: 2021-09-04 06:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 55289c15ec25326d30ec6f48f0719d5b SHA-1: a28e7251fd8610ee2ed412ef8cded6c6bc41bea3 SHA-256: 4370e7e087d9db0d6f85e7f4308485ac19a40437625c853b294934a37e0b11e8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://4of100churchstreet.com/assets/media/files/kivudigogowefuwasono.pdf In PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160871e7f7d093---bufufafuridaderebavafes.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/sabunobijupowolitezizer.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/vajogemalikaribisa.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/bamapolezomurobepu.pdfIn PDF document text
    • http://simonide.org/userfiles/file/33268122504.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/94404260117.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/walazarowafozo.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/1r98sgejmus4b92lcmmvaptej2/61091856318.pdfIn PDF document text
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/11186749353.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/4bf450ddb1d6514b038e0d0a5d2b2df7/91438768938.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/1403102169.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe278fe08c6---giratikugexidabo.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/nomobivagojagukezekisuz.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/dabb4b96569e18f01d6988b902655c40/vipekodap.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/birevifugolepafafa.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/7d0d6eb323a2976e20885c3613772793/rumexebuwerusiwalizet.pdfIn PDF document text
    • http://hopkinshigh1966.com/clients/1/10/1054c114374c88b4a165e91103565d41/File/paviforune.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/rebinasuvikopu.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/gujusaru.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/hv0mn21t03r14d6l7v5c6li85m/83716779383.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1611f6792d9d2a---dinatamirefadetigijegalog.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/43641992996.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/74225747364.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/rgnl36vmisa4ki08gg1gmk1kg5/zomov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=numerical+models+for+differential+problems+quarteroni+pdfPDF 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_off0000c7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7CA 11144 bytes
SHA-256: bb3ab4ac7875c89567ac0c5aa48887b8534d27d568964cef083abdb859effc93
font_01_sfnt_off0000e158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE158 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96A 17224 bytes
SHA-256: 8e2b3d8063919cf69b86f632043c9c140449ad264d4a34b70d81537fcc0428c1