Malicious PDF — malware analysis report

Static analysis result for SHA-256 6929df632c11cb6a…

MALICIOUS

PDF

84.0 KB Created: 2021-09-17 00:04:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3cd39ac66c797bddf246162696b6b835 SHA-1: f2913759c14a390540c1834d137ac70fb4f75eab SHA-256: 6929df632c11cb6a0cfba4b08e2adaf84761a04d88eeee6ac5b6fba9f85b424f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure, likely leveraging a PDF exploit or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://philabc.ru/uplcv?utm_term=plant+net+app+android PDF link annotation
    • http://sjar-tech.com/uploadfile/file///2021090223034137.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a515a3a392---51663415409.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/radod.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/wigig.pdfIn PDF document text
    • https://telorgabus.com/contents/files/29449504831.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/misavogadunaj.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613012ad89753---34605018209.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/36231184530.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/norozapodivakokejumugu.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/paxovixi.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161327dc03d261---jowebaxutafadexamazurine.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142698ec1bb5---xusiwezigomutamukelazasu.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/daruwovakadaxojuvogo.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/dakewisix.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/vaveloz.pdfIn PDF document text
    • https://superchills.com/userfiles/file/31287074515.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/84335644063.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/48769826547.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/30622229566.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/kaxajotokijakijudeva.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/33177798914.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/59912022669.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_off0000e47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47A 18532 bytes
SHA-256: f703e057f0c7ece532ae23ee0949c95011cec4f5d4cacb8bc002bb2cb7ef8e5d
font_01_sfnt_off00011403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11403 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1A 10216 bytes
SHA-256: 907bc456ba250623ef60deefe1acd3b4744c360fe930661ea781617169269202

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