Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c2883f49b6f8803…

MALICIOUS

PDF

74.4 KB Created: 2021-09-25 20:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2a811a9e59ab20b3b373b31c2430533a SHA-1: adf89777bc16125fe50c127cf0520590290728ed SHA-256: 8c2883f49b6f880392eb821ae6b3cb12e7fad7bd808003232b1f96e2e07ac3fb
156 Risk Score

Malware Insights

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

The PDF 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 websites, some of which are hosted on compromised CMS uploads or disposable domains. The presence of numerous unknown URLs suggests a distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://jinanxintiandi.com/userfiles/files/58561789518.pdf In PDF document text
    • https://idd.no/ckfinder/userfiles/files/28518989830.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/wololilujo.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/supekiwoxorokema.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/musibexenugubasexig.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/69690289379.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/43371285640.pdfIn PDF document text
    • http://sissonne.hu/editor_up/tuwetibigoz.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/45261771855.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/tilijedetek.pdfIn PDF document text
    • http://metallpress.info/files/lebevewavogozowedirirote.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16140f37c5936b---rikup.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/60494870689.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/0b4ba737ef6484277ec103235993344b/33546463038.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/14903756994.pdfIn PDF document text
    • http://ewtch.com/upload/files/kimejegadepamiponubog.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/pokuz.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/vixevunopovoxa.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/fosesatogoroxufinosu.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/867259317cbcb495daf0626ed73cea20/96091861957.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/f775560f7c3f006844589255e6bb7409/35871088105.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/25837288647.pdfIn PDF document text
    • http://kprmk.pl/userfiles/file/45859141175.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=cod+mobile+torrentPDF 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_off0000bf8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF8B 17652 bytes
SHA-256: 94e4d805fe2bf88032e1880f6d52d89cb6a1211d477ec56ae0175aa57e04db66
font_01_sfnt_off0000ece4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FB 10248 bytes
SHA-256: 8b54676c1445507b4857ed3c0802a48c165c78100761df66c271b86abca59119