Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f4d334240c47d7b…

MALICIOUS

PDF

79.5 KB Created: 2021-09-18 15:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 186432c8d48cbda993532d6ed4dc7538 SHA-1: 80ffc94edb2805eaf925c3673c498b589033f833 SHA-256: 1f4d334240c47d7bedf2ea25fa9b9e656ddd2477468d662742730769f9aa7374
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. ClamAV detection further confirms its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://bc-arman.kz/ckfinder/userfiles/files/tudekugibo.pdf In PDF document text
    • https://virker-ikke.dk/files/12068640202.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/vonolinekut.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/digeroderefagoxa.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/zojafuges.pdfIn PDF document text
    • http://lollanaclinic.com/image/upload/File/rumulawusubo.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/taviji.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340f1a4a27b---23246093321.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/sedavewenomedorobikijob.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b8027b59d---10875959351.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613590b31bacf---xukazajupexiti.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1631730156.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/71305301540.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/dewaladumujunebamepixexa.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/79587757146.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/vuranejisefaxudowisolidot.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332e446379b---sonaxedir.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/57704913145.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/dikepos.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/masunonu.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/gowodox.pdfIn PDF document text
    • https://dhesient.com/media/28946821452.pdfIn PDF document text
    • https://mackbeks.com/files/file/61328685992.pdfIn PDF document text
    • https://manenshop.com/upload/files/89531101209.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/6p4lfe66isf188653l33mkob66/13956701701.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161392351ea965---fobixizitibajinori.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=android+dock+iconsPDF 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_off0000d684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD684 9996 bytes
SHA-256: 8140c2b075d48da96c4688d9c69726f616e2f1329b932fe0a49ca6d7d52c4dca
font_01_sfnt_off0000ecc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC2 17016 bytes
SHA-256: cfeefd7957a013e2d69fbd74049fd4d267f16dc8440ecf5d61e7c09159c203de
font_02_sfnt_off000118d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1