Malicious PDF — malware analysis report

Static analysis result for SHA-256 92dfee048f4b3f44…

MALICIOUS

PDF

77.2 KB Created: 2021-07-02 19:37:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aa81f66ab962362c0ca7bb833d923fcc SHA-1: c358a5fc79ed592f7eb889cdc0d2bfa489a0685e SHA-256: 92dfee048f4b3f4437179b935287f846a8be0f206b27546c71f1f986b45cfb7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML_NYX_PDF_MALICIOUS heuristic and ClamAV detection strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d279ba2bd---lilomadujagisigon.pdf
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/vajuzewiximajikar.pdf
    • https://moto-trend.cz/public/files/fck/file/15789583060.pdf
    • https://doctornhospital.com/banglanews24/editorsfiles/files/67680782924.pdf
    • http://www.allatpatikapecs.hu/images/file/kalikokeno.pdf
    • http://stensoproject.com/userfiles/files/xigur.pdf
    • http://adamlegal.com/userfiles/file/75806450861.pdf
    • http://maszyny.pl/userfiles/file/jumigedewetuwot.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/517bacc04398de28c3a1f33c798f8651/27364644877.pdf
    • https://businessservicesuk.com/userfiles/file/11723952329.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/seulhc77b88ncm6v62fv3aamh8/nuzevegumimesuvewigi.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/9d651a10758069c75384f36c3e227cf1/vowezasokazuvubebuz.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609454dd3e901---49556568929.pdf
    • https://ms02bet.com/contents//files/77065767811.pdf
    • http://cngwalk.com/fckeditor/userfiles/image/85863273431.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607614c358dc0---26456626599.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608528ad97420---xojodabixobipoxeko.pdf
    • http://farmaciafasolis.eu/userfiles/files/zemopelovajetidudifa.pdf
    • http://nfc.soo.jp/file/29087270962.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/dc5559pkbd7cgvdfqkeguj86km/mofugonorofefirakonifa.pdf
    • http://eastmoorclassof1970.com/clients/4/43/4343e427eb1b0a0668350338a4d6b623/File/sujofebukoduz.pdf
    • http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/sebivaselibupupixopetemo.pdf
    • https://semineebrasov.ro/printuri-fi/files/92906490227.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609475583d723---nelatemurido.pdf
    • http://sbs-group.co/userfiles/files/58605070025.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=always+at+your+disposal
    • 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_off0000cd67.bin
3656ee8e2df8f885ff2d56d3fd8b18c770dedc8850ad7d15d3524b1b2ee15cc4
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD67 16348 bytes
font_01_sfnt_off0000f794.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF794 16792 bytes
font_02_sfnt_off00010fab.bin
d67d06ebe3c3f4f2408133fc92b90e2a58446afb466fa352d06333ec1750808b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAB 10428 bytes