Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc4f0026de0ee595…

MALICIOUS

PDF

91.2 KB Created: 2021-06-25 15:29:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cbd8a0da7d7b07bfaf598dd7d91e8291 SHA-1: 43441fb770a19ba2fcee124cd4397c9b631ad993 SHA-256: fc4f0026de0ee595d292284fb816898073b8873f962102f69a5a54b132d28dcd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. This suggests the document is designed to act as a link farm, directing users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://gemculture.com/userfiles/file/6775937525.pdf
    • http://lordbeaverbrook1973.com/clients/76835/File/88393416315.pdf
    • http://pappteam.hu/userfiles/file/nalelefeg.pdf
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/c26b2950a6451f4000abeb479694df39/gopix.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/6702195130866fccb59dab35eafd151a/75259493821.pdf
    • http://ayurveda-shiatsu-nice.com/upload/files/matat.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/6a05f3fdca863db9e363113afd2579a1/4744772085.pdf
    • http://ufnk.fr/app/webroot/files/file/lewosukisiwakudidoluzima.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/skvk7i7d1sl59gf113v9i5rpde/xodifijezem.pdf
    • http://daieimotors.com/js/upload/files/juvemakujakugojibotejuje.pdf
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/a2c6d1bc663cf36d9cbc51b9e1c162a2/27752073102.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0fbac9507---89714219891.pdf
    • http://mahnomenalumni.com/clients/879209/File/61148380535.pdf
    • http://shuswapladystriders.ca/userfiles/file/vagowavukat.pdf
    • http://budoprojekt.eu/obrazy/file/fetomadigefiwuna.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4152ae6a4---firuxapevulikisulesovuwu.pdf
    • https://avonsteel.com/UserFiles/file/xasavopasi.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/6bb756a71fdbc7e6390f47b93fba70e0/98374748298.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=if+the+need+arises
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011d27.bin
4d308857dfc2917356e694e6acf0c5a4eb31e36fc4757913b02929b187898be3
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11D27 24060 bytes
font_00_sfnt_off0000d60d.bin
d97ff429b6f3524c084110940111dae81c2aa7a94dedd35f8c7eeeacf988876b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD60D 18448 bytes
font_01_sfnt_off00010516.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10516 16792 bytes
font_03_sfnt_off00014773.bin
965de590d3f7c28decd7035fe93e700ac419ff83040532cf23be6184420a25bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x14773 10236 bytes