Malicious PDF — malware analysis report

Static analysis result for SHA-256 0658a3ad5b07a244…

MALICIOUS

PDF

79.1 KB Created: 2021-09-20 22:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bc4caa77edc9daf37478340e8c768a7b SHA-1: 93d2e3a1c03671397e9a1e1ba5706aa039760b82 SHA-256: 0658a3ad5b07a244fb25f9839a27a05fe4c44dc1f5efc9a1159bb70026d34be5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://irlanc.ru/uplcv?utm_term=minecraft+one+block+survival+map+download+for+android PDF link annotation
    • https://cukimentescukraszda.hu/files/files/tufig.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/62293251881.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/bewoduwofawade.pdfIn PDF document text
    • http://studiotecnicostradi.eu/userfiles/files/rixubud.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/4199746756.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/68506238481.pdfIn PDF document text
    • https://hippodrome-compiegne.fr/www/uploads/file/22643339193.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/gaburap.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/8fc3fdc142b240cb54d1b769d2a8dc6c/13376306045.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/jonevajunuxemexutaj.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/fivinazejedogafivovabuz.pdfIn PDF document text
    • http://feg.vn/uploads/files/zigifabavonepovufulov.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/negilipirimijazimawek.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161321a5e97074---sakisewovatoxe.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/zaxipasopipim.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/96647084603.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/6ab6938a8b2206f9739b80b06ec8fcda/lavugerudelefo.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/25365588186.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/nizixexukelulupinefidi.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/34299676639.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/172440432461383606d85a5.pdfIn PDF document text
    • http://infosierra.es/images/editor/pavifisiwarosakuvipajotet.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614856691fba0---96613897769.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_off0000cd8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8C 18256 bytes
SHA-256: 4ebcda5fd091516366af3d67c463816f86ead613e79042f02546475845883cfd
font_01_sfnt_off0000fc93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC93 11260 bytes
SHA-256: 05b5cd98f3c236dbab9c7d33ec64c52f4baef811a516229881197812ff51a082
font_02_sfnt_off000116d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1