Malicious PDF — malware analysis report

Static analysis result for SHA-256 d859a5e0e02fff36…

MALICIOUS

PDF

87.1 KB Created: 2021-07-05 07:18:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2a9a6f8d0350a28326cfcde3dbe5da9a SHA-1: 2da20cc54fe105889cc25130743ba25c5f0bad98 SHA-256: d859a5e0e02fff362b04b66488c5be41558d17831085c314be41dfca5d1565a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains, suggesting it's used to distribute phishing content or redirect to malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a deliberate attempt to create a network of links on potentially untrusted hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=braves+opening+day+2021 PDF link annotation
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbcbd13171---40760037737.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210611140832525.pdfIn PDF document text
    • http://www.bash.cl/media/file/36635557847.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/87798411508.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/47896769766.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a06b1a3a05e---suzamum.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078fc0abbc64---99282842514.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/37981139142.pdfIn PDF document text
    • https://medtek.vn/storage/file/mezenunovu.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/bddcc0e84c470213f5a8391e6cf77459/wisijixabu.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/tojimoti.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/meron.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/wuwabovifebubowe.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/fusiviguvi.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/vizujebojesakujofag.pdfIn PDF document text
    • https://viratrip.com/basefile/travelasreviracom/files/82164789072.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/44868796834.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/4ac2766d69cd7843827e32a3da40cf75/90193389046.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/1aqepm01r244kulhmla1l20g04/tezunux.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/2e779f016a2d7172c8860130c2053074/47094984178.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/12727413009.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/13380193051.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210530061031.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b364562c29b---regulas.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160a1241994a76---5210848887.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_off0000ee40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE40 10952 bytes
SHA-256: 253b03d0abbd998c2f305b56d7f230cee6d2e2055d0001af2ddb3d00d62ec273
font_01_sfnt_off000107ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBE 18180 bytes
SHA-256: cffc0226d8a63803f62687e9d0fba6c626789577b3d15bcd20100e0bc5cf36a8

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