Malicious PDF — malware analysis report

Static analysis result for SHA-256 20479fe9d03c8af1…

MALICIOUS

PDF

85.1 KB Created: 2021-09-04 01:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2acbb094d64b9f3056946788a4722e13 SHA-1: 56534fffc010a1a4523a40d0a1f816f76567e556 SHA-256: 20479fe9d03c8af1e3825e2848dabb0c26bd0351566730d68f8e2894dcf1854c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://studioarchperissinotto.eu/userfiles/files/melosezegepero.pdf In PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a521e0e1ed5---22221829689.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbaa044e9a1---93178614476.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/xalomixoj.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/lofiposusapimovegakazika.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/xopalolasosilinejozok.pdfIn PDF document text
    • https://x-software.cz/data/file/66078821374.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771f5c1c9a6---75443072936.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/81036612064.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/55168611453.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/8igumqdo41dndoll3p56576dvm/85363238564.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/dc6dc3035faae7dbb49947e91cfdb12b/17148666533.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/ks9o67nvkvj690u60nqkql6fmr/80432806095.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/566d1063ef02d396e0db8e512ad23b0d/42831482704.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/16062107710.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ebe45d316---61249009452.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/mizamurumop.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/donisudulel.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/babalewalelebezoxatidu.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/pesevapuniwuxexobatiwiwo.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/a2496ed80f36e680594d809baaea8e55/pajotis.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/mekojupenaxozexumigarige.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/bbse148g5ha2d4ohok2qthsbo3/bosabun.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/xesazarututaxetobevaz.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/14002040728.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094c8e9149be---julasefajiwirijojuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=essential+elements+of+a+valid+contract+with+examples+pdfPDF 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_off0000e63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE52 11120 bytes
SHA-256: e8666e397882dfed4d5f02993fe1df8c737600a4acddc58630494edafea17b49
font_02_sfnt_off00011826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11826 17688 bytes
SHA-256: 75ddfb79e102d31e8c9c53c0b46a2a034e1c379db0d677ed215a28d8bbd8dfaa