Malicious PDF — malware analysis report

Static analysis result for SHA-256 f97f619122cde942…

MALICIOUS

PDF

73.1 KB Created: 2021-09-26 19:11:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8d509312de70edb840a1769b3e599398 SHA-1: cda0e390bdfada6ba6c2eb261a5f2347aa362d63 SHA-256: f97f619122cde942a7da150b24d97d5d373a348333ec76eb89b3136ffd621972
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 a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to various domains, many of which are hosted on disposable or compromised CMS upload storage. The primary purpose appears to be directing users to potentially malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://mimarkamilozkartal.com/userfiles/files/kibivisosabe.pdf In PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16144d53a53bd6---mepovelasedafikixavikuf.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/85795811223.pdfIn PDF document text
    • http://sun-tes.ru/files/file/79351565514.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/94271677463.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/rumupasi.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/19674541182.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/cd288ad0674fd041a0ac43c9fd9da95a/gugukagexisepemavetodazog.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/napogabunilamevozajofuzaz.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210920_3E8B83AFDFD662CE.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/27978062850.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/64572001857.pdfIn PDF document text
    • http://orlickachata.cz/files/files/67991677170.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e883d0f37---62594378519.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/37277159344.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/jusevojekoguka.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/70188165993.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/f63qv0drl6gd93kf4admb1r2jq/sazosigijifeverogodi.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/59530128723.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/zomesonuginovedop.pdfIn PDF document text
    • https://gadapavimenti.com/GadaFiles/file/firokoparuvaru.pdfIn PDF document text
    • http://envigest.cz/upload/file/befezodijodarepes.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/35948493557.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/45796607553.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/26980210982.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=android+security+update+january+2021PDF 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_off0000b68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB68A 11080 bytes
SHA-256: a45fc8b6dd1743cbda52330c995b9c4bb5fa13062e0874265f993885b9ef6037
font_01_sfnt_off0000d0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B6 17940 bytes
SHA-256: 00926cbca3a270aee41f3d700c085fb3c98005c41cf32e29631fb13fe3cf5905