Malicious PDF — malware analysis report

Static analysis result for SHA-256 df3dafe144fbb003…

MALICIOUS

PDF

70.2 KB Created: 2021-09-03 20:09:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7e3a89ade2835b1bdc174fd9df7aabb5 SHA-1: 904f774dd518314a635a57c2f134caf7986c5cbe SHA-256: df3dafe144fbb003629e013b6616d41ca7e3709fa3b8e4ac8050f82497ba6d6d
154 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple compromised WordPress upload directories, indicating a phishing or malware distribution attempt. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded URLs suggest the document is designed to lure users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6257

Heuristics 5

  • 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
  • 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://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/40b2087393852bc24fd9f620ef43a222/42471195570.pdf In PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bbb6ad060---45584082255.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/3c145a0dd6ab25d3f193d3d94e8e8c25/mapazamebum.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/59c61d09d8a763e9c7e3ec0409409b49/gadatuwuzumenijopibogawu.pdfIn PDF document text
    • https://topjobsnepal.com/ckfinder/userfiles/files/dipakivapukuxanopuj.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///woniwulem.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fc3fa3f4f---jatajifobolo.pdfIn PDF document text
    • https://airxps.com/userfiles/files/81815832381.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/pozoluwikoluju.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/79980615853.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/zipebijatodepuxawe.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/14088063731.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/dmlgnrhraslb7hcjdldba71olj/58261976643.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/1d809b8b5d2313cabf5e388b92bda788/19353530356.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c8a75000d---84547563515.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/fumav.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f75f8d37c---filonex.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c6a1da70d---goronajiji.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/65dd0b32497e0839450c6700dd0b51fc/39072809184.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/13691704173.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/55f6eeaf429e747f1278cb1516d6de6d/44231560952.pdfIn PDF document text
    • http://qdjshg.com/files/file/dazofebajaratadujejagupom.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/vemeparagulevesab.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/59466363604.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/4912276bdb097c17d5587022bd3a8056/rumulinarusitag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=the+beatles+for+string+quartet+yesterday+sheet+music.pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD617 17044 bytes
SHA-256: 88cead28f4a675397c5625775ee860459eb1d752e01159cb3ad488927ea364a6
font_01_sfnt_off000101b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B8 11596 bytes
SHA-256: 55cf1d4f9842a2c4c268e78a164634b9377f9d00c0edcde05077945ede98ec50