Malicious PDF — malware analysis report

Static analysis result for SHA-256 02dcbb823b2a367d…

MALICIOUS

PDF

85.1 KB Created: 2021-07-06 19:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e7da02b41597d8521e6ae8ce06dadb13 SHA-1: d635d5f7dd0ce5e769b1023c9fbc89c8a12e2d13 SHA-256: 02dcbb823b2a367d0d9b2773d881b10cc04069731cef368bf47451f04ef95f1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload storage, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://wjvanderheidedienstverlening.nl/uploads/file/dekosidiv.pdf
    • http://ukrainski-rosyjski.pl/userfiles/file/lepobukiselakotisowewo.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d5d9bd91a---pojamararip.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609239e73cb51---60014795385.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/297e3801a7d93897a7178c8be659ddcc/13513200192.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a94f891583---guwolesikimapesaresexax.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160784ab418e7c---97394619333.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074206e41799---77965019987.pdf
    • http://asfalon.com/__files/file/86619956658.pdf
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/50197144474.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/78f03eebd5a424e7fa371749277831fa/6050593439.pdf
    • http://www.thaiboat.net/image/upload/File/gupaxisabiguzojav.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/334d239bee6ae4d7e22632fe92491735/77378322124.pdf
    • https://nezrenpin.com/calisma2/files/uploads/85007467728.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085255f22a80---wizidewetabexizajigexozal.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3f5cbd195---sadawevubuwogu.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b634b7db129---44861907742.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/54c45b2fdbcea88afe9203f3c96c2af4/jamolorokanikivom.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160717c7f040fe---tezaburigivewuludufunum.pdf
    • http://birzebbugastpetersfc.com/files/file/21612464274.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/1284rn2c6sbohvh4pk37fu23v7/49689593310.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/b74152b0378209fed6c3e35e367f6ffa/63970991350.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=what+does+manual+duplex+mean
    • 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_off0000e919.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE919 16792 bytes
font_01_sfnt_off00010130.bin
e2cc6fb7410edd58b86463e081d4d86a35dfc9b3cf6cb0ecab3150621f846b25
pdf-font-stream PDF embedded font (sfnt) at offset 0x10130 10660 bytes
font_02_sfnt_off00011970.bin
87e38015615190ed627e9fbbee18551d86023c238bde2a0a083260eb0ff4c5c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x11970 17552 bytes