Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eff8107f1f8f3fc…

MALICIOUS

PDF

74.8 KB Created: 2021-09-03 07:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f9ffb83433bc067b5b88e102fc661641 SHA-1: d279bd602e1579eaedb1c72a40576f1a6736c859 SHA-256: 7eff8107f1f8f3fcfb8682b92470f4ebd38ee3bb8aa33dee31f617d9513d799d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, presenting numerous URLs that likely lead to phishing sites or further malware downloads. Several of these URLs point to compromised WordPress installations, suggesting a tactic to leverage legitimate but compromised infrastructure for malicious distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://coretry.ru/uplcv?utm_term=deriving+formulas+worksheet PDF link annotation
    • http://www.allatpatikapecs.hu/images/file/80129399528.pdfIn PDF document text
    • http://xn--kprq5pvqklteonubj6c.tw/CKEdit/upload/files/7354172567.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/72488992461.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160803a1bde65b---40342545592.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079ce942be1a---33945317711.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/82402417772.pdfIn PDF document text
    • http://vanphongphamhienluong.com/upload/files/34909143409.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810cfaa88ab---72147880294.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/04a69dcb80dc368f8f0c4fda715723a8/40521728942.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160beb987ae167---55293622213.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d3f995b6f69---mubumod.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca2ab7a3da---sutulevijivupejegi.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/26738263099.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/3922469201.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/funebedakuve.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/858549218334a4c6e3ab1af9302c7708/kobobufibujagaviw.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/28653153443.pdfIn PDF document text
    • https://dintek.eu/uploads/file/miwogimidanavojobafanug.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/bezozevalinipama.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/vilolisujotageduw.pdfIn PDF document text
    • http://lex.tj/img/file/nitopiwebalinub.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/16858350309.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_off0000c00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC00A 11008 bytes
SHA-256: 7dff46701457e0730ff46c89d0583c1b9ad7b22b76a752240eb44c411a1c2994
font_01_sfnt_off0000d989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD989 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19B 16936 bytes
SHA-256: 0e260d954fc91900216964d710661dd2def62331b5f5befa018b53353ad9ab35

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