Malicious PDF — malware analysis report

Static analysis result for SHA-256 25506b460e370eeb…

MALICIOUS

PDF

80.6 KB Created: 2021-06-29 03:18:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2e6956206e4008ced0a09eb98b04aa1f SHA-1: 2fd6f427887606dcc271cc1ef5a42b40dca7c6ce SHA-256: 25506b460e370eeb10fedfee532f858ce842fe481aa736d8ab5d8b4b3ec1cc49
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URIs, many of which point to compromised WordPress installations and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URI patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://comp-art.ru/userfiles/file/4696765539.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea545c558e---77245431071.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/et45jhtqc63vera6qq9givnvh2/92277877449.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8ee21d2aa---wavijixovulewatididovages.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1f5e27939---22190821515.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160963bee0ba28---40314903659.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99aad2a96---90506392739.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/3b63e2d095c3cff0a1b64bc62ecd5452/monunelonivijatofagivolu.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/c7face3b5c5c60580c9814d440d5fc08/joroful.pdf
    • https://nenanhduong.vn/Upload/files/91181636323.pdf
    • https://sasalidayanisma.org/uploads/file/satevipivuxeroxenokoje.pdf
    • http://nicenpos.com/userData/board/file/gobefo.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8d4a78c50---fakavureginowugitakedidi.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/tijibafuvolesibitan.pdf
    • http://antonio-pelella.eu/userfiles/files/79974374145.pdf
    • http://studio-rivetti.it/userfiles/files/siwujazosapariximo.pdf
    • https://fanaf.comarticle_ressources/file/77281068588.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16089dd51386fa---gugaxito.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a8a470f17---xokefuvokobafi.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/435590adc7010c3885a665936d67f6c1/40611834542.pdf
    • http://alliance-ltd.com/userfiles/17066875779.pdf
    • http://jshtextile.com/UserFiles/file///bobitofukevasonavoviwuw.pdf
    • https://carlojans.com/cms/file/fakezum.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/gi3dtr3v6neisf9djmshm1bfms/zesalazemav.pdf
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1225e181c---40194938442.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=anime+puppy+drawing
    • 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_off0000d9b4.bin
2b62a493cd1666fbbb40aa54cca3c70f957a1c38d23c7072695ae0be488fd98f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B4 16836 bytes
font_01_sfnt_off0001055c.bin
f7de0babc8d05354523aef32bd5c4eae76f9a1f08ef314a9edbe329290958f9f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1055C 10584 bytes
font_02_sfnt_off00011d4c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4C 16792 bytes