Malicious PDF — malware analysis report

Static analysis result for SHA-256 52344c390d6c80dd…

MALICIOUS

PDF

86.6 KB Created: 2021-07-07 01:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 014f6b2925d35c4c15af0c96c24b8814 SHA-1: 3e78c08c8b5634657a4302c4927a3a9082f1272b SHA-256: 52344c390d6c80ddb9fe0355bc41f1b7feb367a5bb81f321fca331d683b6563a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous disposable domains and compromised WordPress sites, suggesting an attempt to distribute malicious content. The presence of a 'download button' heuristic further supports a lure-based attack pattern. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 https://anfauglir.com/images/file/sexopujol.pdf
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/95d60b6fcad0aa31c663f74ee6e8f271/92568892776.pdf
    • http://kurier48.pl/files/userfiles/file/xerafezowezubi.pdf
    • http://elitaliaweb.it/upload/file/8410224345.pdf
    • http://studiosaletta.it/userfiles/files/nuxifukirisawaril.pdf
    • https://stayatrosetta.com/wp-content/plugins/super-forms/uploads/php/files/evpap8l0m41j4fpjsan9gve7ut/77815036500.pdf
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/v90cuc8hiflba4hov02ilesng6/86420461690.pdf
    • http://954move.com/clients/4890/File/3301195370.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/ui9sqmh4aogp6tuhr7misc9pd5/zituvipitimevatub.pdf
    • http://yangpupark.com/uploadfile/files/80833038551.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e85c0f3f1---16105313092.pdf
    • http://albino-pitti.com/pub_img/file/fipolijerapuvuleto.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c050c15b76---67528083949.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac46bd4cc62---tawalepokadupavi.pdf
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/xopogakomewevujibezasuto.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/829b43dcc4593a83304502e05f9faebc/bodibiduladetur.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608842927ffed---dekesak.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b136e8a89b---50067368689.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9c203ec85---joboboxenemubapawoxojego.pdf
    • http://activesolutionelectric.com/images/file/95357086147.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/4tkhm54jhv8mmutpvj02sfhd8p/66529207701.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e539cdeb40---mipokamurikepukatigilub.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/1f7050d3b66501991ee44b53073881ae/ferufojedorabekisaxefapa.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16093b060328cd---sufaluraxiw.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e904e0f9da---rawuzijekasugamazifugi.pdf
    • http://nano-vip.com/ckfinder/userfiles/files/zizudewer.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=annual+income+salary+certificate+format
    • 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_off0000eef2.bin
33cd30fd875922a5e795fcb788086097d40178410c25e2b37a111cfd14cdc436
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF2 17312 bytes
font_01_sfnt_off00011c0c.bin
0ece3c7bdfe045615a31b44c85aa96635ca688a23933be5c8430969565a4863c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0C 10692 bytes
font_02_sfnt_off000134a6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x134A6 16792 bytes