Malicious PDF — malware analysis report

Static analysis result for SHA-256 f870e8bb7fa75138…

MALICIOUS

PDF

84.0 KB Created: 2021-09-02 22:33:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 33582dcdaef07e901483cc64b0f60001 SHA-1: 6dd50e506ab2f2d0341c5237dcee17f9e5e66feb SHA-256: f870e8bb7fa7513818e4313fba38ae6cccd37b2b0a28aeb44cbaf78906afaabe
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised websites and link farms, indicating a phishing or malware distribution scheme. The file's purpose is to redirect users to these external sites, likely to harvest credentials or deliver further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=tratamiento+para+artritis+reumatoide+pdf PDF link annotation
    • http://timandlor.com/userfiles/file/16991569332.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/d6bf6a0989909b237aa62885524937a8/zimuwonugirabonake.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/3nnjvu816mbl78ru5q8dlssjc7/73038114257.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/52806a9dcf63cc9bc3d676f3bf694b1c/wubuz.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/7efe48f77312df6df0100eb1e8049935/mufubuj.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/66361936075.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/69140328606.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/vunokoxegoge.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/b521b3e79eacf0b26a0497dfb5ee4f89/jabotivazojulus.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c81095fda---91098327615.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/ed87fdfaca32801e0d5ebf7aaede4423/37273574889.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/qp5g271i2q527g2kgogsh55ja4/68516198547.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160968da217b03---rukuvepir.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/a2e897ab5d8d5f8ecf6e155417179f34/6826909053.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/cd2fd4c0428df04003a4e4919cae940e/fitemipukipu.pdfIn PDF document text
    • http://vhshf.de/File/80271369563.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/f378921ee19e7ce318dcfa4052ad1432/vupatovovepobisamu.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/e3b35e0ed47b4d0189585d89d537ac87/siwuza.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/nazidevekomejupekutur.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/7f099qfjoj8bi2rqm92o5i30l1/lurureximorusixu.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/eibksju8mla7oc1ol7gv4s73el/nejepa.pdfIn PDF document text
    • http://legendtec-eg.com/wp-content/plugins/super-forms/uploads/php/files/0srkost9un2nde1ni81e37vlp5/tibifikinelemupetozosa.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5eefad89fd---wusabuno.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/3e191db81bded2f48a5230200ae674e1/76310203637.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_off0000e0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DB 19188 bytes
SHA-256: c8e15f59474104839fed62a2701592db7bc874ff9283a5d924729781c27d4a9e
font_01_sfnt_off00011193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11193 10676 bytes
SHA-256: f89e492ead9332a7ae280f1f21c79f79514b9b12eb06dc74f5eccf94602d01b3
font_02_sfnt_off00012a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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