Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d3e16fe5feb8f12…

MALICIOUS

PDF

77.1 KB Created: 2021-07-01 11:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 86f05eb6a818d3072e896594b56fdbd9 SHA-1: 29caab462857d41cf5777ad432febc9c41c7f790 SHA-256: 2d3e16fe5feb8f12f809ff0b294e0a1a9a6a9f7c53674a7b41b1bdd3e9b8076f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to exploit users by redirecting them to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/28258214388.pdf
    • https://wfca-czech.cz/temp/userfiles/files/guteta.pdf
    • https://windsbs.biz/files/file/15523571160.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090a0a6931e3---peronulijewunoxadef.pdf
    • http://veterky.ru/ckfinder/userfiles/files/bafuja.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/22b38e8af2a603e824ed158d3e83de64/90259285101.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/89bda484ee379de75aea1044d51b2361/suvedejovebaso.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb5f6ab0a6---gofurudiw.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755a89b5f90---65504622735.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee2dd83bf5---sepivex.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/854ccd4e794252f5b543d30f2c6bbe65/22479253975.pdf
    • https://acronimocostanzo.com/userfiles/file/25258425112.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/r8c8bpapr43n9sa56urfu1h5l5/17516266480.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eda074343b---lanerikutavevigazurivunas.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/7fe9f33e953472ba580d35ea4074b538/73615227866.pdf
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/6901312608afbcc08cf8a929830ae384/xixiwirakikavuvolota.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/d55b8c94310302ecad7a551677f886ee/20777587008.pdf
    • https://srilangkapools.com/contents//files/roripagosoputazetugo.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf2d7bcbcc---fetekusodefafiv.pdf
    • https://thuaphatlaihanoi.net/uploads/files/8653544918.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea2f197fa7---xasotu.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/a7ef9f5cf481d485ad0faba3f9580c1f/63861747800.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ace08dafd---pirubatogufilidosubas.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160794ee2ed4a3---52304714019.pdf
    • http://dailygiasi.com/uploads/userfiles/file/pofas.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=ice+age+dawn+of+the+dinosaurs+gomovies
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c993.bin
f86827b92fe659507b177f611e532cf050836bab28994fee69205c03379dfc48
pdf-font-stream PDF embedded font (sfnt) at offset 0xC993 11080 bytes
font_01_sfnt_off0000e319.bin
d94e42bb8cb76df9cdded995804b29f58f6ffa070023db7ff8a4f753fda918c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE319 17072 bytes
font_02_sfnt_off00010eae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAE 16792 bytes