Malicious PDF — malware analysis report

Static analysis result for SHA-256 013f8d977a17c2dd…

MALICIOUS

PDF

74.8 KB Created: 2021-09-01 01:30:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9094fea7c1651afe0fd93f87b2c459af SHA-1: 1542eb55cdecab016d4801bb0f2e7622ef583042 SHA-256: 013f8d977a17c2dde103761ca9e29f6e9a8fd134ba1f97e43a2fae107dcacd0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The primary attack pattern involves luring users to these sites, which likely host phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://crysiq.ru/uplcv?utm_term=div+grad+curl+and+all+that+solutions+manual PDF link annotation
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16078b9df776cf---72888068709.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/4105321408.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/43104157100.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/52374032815.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/55002197832.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096290978659---1644489215.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/b87ce5ff366195527186cfb01b3dd663/17704765808.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/4af48e4ed253afb4d3e4fb5b4d36aa64/70404575804.pdfIn PDF document text
    • https://digireg.org/upload/viwega.pdfIn PDF document text
    • http://tulga.ru/editor/files/79878412051.pdfIn PDF document text
    • http://stavbyhes.cz/ckfinder/userfiles/files/75077387351.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/lusozenebuvajapepula.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2ba45fdf2---nerixifab.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111afb31f6a3---vizinopezori.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4eade176f---lasobuvazezakitisuzeveb.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/cdde0e750e94d9ff7085e162f7a04f73/73631392111.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/gulonukukozuvasodox.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/40e1ec5d3e441dd54062ecc2ab2aafc5/30613826310.pdfIn PDF document text
    • http://vintageguitar.ru/ckfinder/userfiles/files/94730942343.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/161055c817489f---pesijosewenejuze.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/10d739ff38bf3cb9a02461db5a11000d/najusorutepe.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/fosokutalojetobakob.pdfIn PDF document text
    • http://willbramephotography.com/kurasopijine.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5e37749a70---kojeparajibifu.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_off0000c27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC27D 16188 bytes
SHA-256: 4c6335997ea3b4c987c418e99327ecc5752fb0e00be2d75411f88ab09b03bde3
font_01_sfnt_off0000ebfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10412 10852 bytes
SHA-256: 6866ed6ca773b917f50e1e4490c9844b5c6b4cf9cefd1e1916e7197c55246f2f

Open this report in the interactive analyzer, or submit your own file for analysis.