Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ef93672c9ca6d44…

MALICIOUS

PDF

74.9 KB Created: 2021-09-05 19:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0347c74660a416b059cc512f17dd701f SHA-1: 96ec89da50e92bd334096960f63b946126ed2b1a SHA-256: 1ef93672c9ca6d444bf2c1d2e8bb02d262767e1a4695a6953c063b788ecf38f3
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or phishing pages. The presence of multiple external URIs and link farms suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://archism.ru/uplcv?utm_term=gratitude+practice+worksheet PDF link annotation
    • http://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/rajadunalowa.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16085b15052532---75664381409.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92071a68f---tirudewineponeneba.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fa8c683853e---55782374318.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812138d662f---kanud.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/zajidosawaz.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/28392281824.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/fofetepavidiwonumemem.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/jezunusubobosinovulupe.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/91823591674.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/d7s20ct6tcpgf1jhkkpvlhan3m/46856549877.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aec44207141---pezumapitawe.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/1b3339c9ae00fa0830701b620585cc6f/7078782852.pdfIn PDF document text
    • http://dalaichau.com/files/21543898917.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/85056403770.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b06f460c1c---24555430606.pdfIn PDF document text
    • https://nic-n-nate.com/files/files/12259646684.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/64777838980.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/vu4erljd8uta3t3anvde25gbh2/mugimitevuvedivexas.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160997a5cf26b1---74037960788.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/gorowog.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/97609334996.pdfIn PDF document text
    • http://edins.net/userData/ebizro_board/file/21561854762.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/gijorirotelanelosodepomob.pdfIn PDF document text
    • http://pnalog.ru/images/file/duvixafo.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/40951001760.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607160e227536---livefi.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/ib20f2oifr2ubbtc6sl2qemelv/49815130246.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_off0000c229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC229 16508 bytes
SHA-256: 36daad05a69f94417b186bb2c10a4ddcdf07c799d74bb9c46adf5effcca45923
font_01_sfnt_off0000ec6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6A 10776 bytes
SHA-256: 91c2758fc9e37c1f66e5c8d4457a49713ea739338573c8cd085b076eb94ca102
font_02_sfnt_off00010582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10582 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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