Malicious PDF — malware analysis report

Static analysis result for SHA-256 aef376f7e844e907…

MALICIOUS

PDF

85.2 KB Created: 2021-06-26 17:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 44a35759dc315c78eba8fc05bd714666 SHA-1: 001785cb2766dae7d60b0b32acec2ccaf1ea863e SHA-256: aef376f7e844e9070e79602989caf743823b2e515d51f135de4eadc455653e08
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure and embedded URLs are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=can+you+eat+cooked+rice+the+next+day PDF link annotation
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/iapcl7kbsn5fb0eb92md0j8sg0/vafaserin.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/bf4bofbmq7ur0o0kci4e2sae43/30270830295.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/35939661804.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/bkbejr0spcvurlf1eeemon2ud0/botademaregat.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/9acm26q3519l8tocomldaidl08/58086164627.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/7090751902.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/batovufolekodubir.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/d3d212acace09189f0880a252850c491/74557161660.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/dosevebutidi.pdfIn PDF document text
    • http://kalikraft.com/images/file/pukixan.pdfIn PDF document text
    • https://codecs.ro/images/file/3245731902.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/gefinafalige.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/89ec91737d70281162ac5ef935281574/kusosugibumilija.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/40213553984.pdfIn PDF document text
    • http://bethtikvahevents.ca/clients/2/20/20a91c0cb94b02964b0d1c5d980f1596/File/8353448904.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9eb28634c---zojedoge.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/nkea7usj2k086mor2mmqdlkl35/gekiresawebefakujavap.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b38ae5af797---xajuduxujafusuwobovujod.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083dbdb3daeb---fuxeru.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/jiganepumitevigipipaf.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/78977103367.pdfIn PDF document text
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/83597bdac7bdd0346d61aaac898782fe/botunigobuneruz.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e56944bf01---nusimijilotiporu.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/momilug.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_off0000ebca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCA 16528 bytes
SHA-256: 7f8f8cc28fdc9b6ac9d9bab520924b50ec12b6a98fb022b6b0da834ec21afcb3
font_01_sfnt_off000116b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC8 10692 bytes
SHA-256: 7c4c2057deefb4d2d142d1abe55f238284c8a4b4e56b633e793debcc52edde2f