Malicious PDF — malware analysis report

Static analysis result for SHA-256 f56d4710962ba16d…

MALICIOUS

PDF

83.9 KB Created: 2021-09-14 11:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aa0887c61ef32f1d34057cde88295d38 SHA-1: 6d8fa5829dcca03c97ceeea5086fb1c4c958ca2c SHA-256: f56d4710962ba16d1c3a3bbb13b480d37349fbc92e8d8d85cf5585aa4feebfc1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing or trojan delivery mechanism. It contains a link farm pointing to various domains, likely intended to host malicious payloads or redirect users to phishing sites. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs users to open a password-protected archive, a common tactic to evade initial security scans.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://krisoc.ru/uplcv?utm_term=how+to+see+unsent+messages+on+messenger+2020+iphone PDF link annotation
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/074339af6e66fbff81706e547698ddb6/82708024978.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614046ac75bcc---buruninewojenojixu.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/jaratologadolav.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613031766afd5---91752278700.pdfIn PDF document text
    • https://protrialse.eu/files/files/gazaker.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/84016933446.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210903_33C3ECA0AFDF24E3.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/99548199619.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/tobanabuvapazemikizugi.pdfIn PDF document text
    • https://tgvl.in/uploads/fck/files/63695882716.pdfIn PDF document text
    • http://greenld.com/userfiles/96231564193.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140457655ed8---20892005552.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/molixosopozotodulow.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/bejugibovivajedex.pdfIn PDF document text
    • https://mimzyonline.com/userfiles/file/ragifarodozipegumanuweze.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/zibilirukexobizenojak.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/nozanokafa.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/57995670491.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380152e586d---54221598994.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/53437010513.pdfIn PDF document text
    • https://kawanmto.com/contents/files/91579705074.pdfIn PDF document text
    • http://cosyromania.com/media/file/54929254494.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/63752118135.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_off0000e14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14F 18024 bytes
SHA-256: 315c12b6a4d8aaebbbe459b53e51bc5e46d57975222c5e9382d2a00914cda622
font_01_sfnt_off00010fe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE9 11072 bytes
SHA-256: 26d94f307149ecb1ad8928b84d4364ae0e9499cd602c8375950132427886e8ed
font_02_sfnt_off00012996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12996 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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