Malicious PDF — malware analysis report

Static analysis result for SHA-256 dca6b21169cf2ea6…

MALICIOUS

PDF

82.7 KB Created: 2021-07-03 15:17:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6506abf4f8bfd4a196e39051b2d1f48c SHA-1: d21ca1c38377be1c379e60d3fa5cec6b1bd2b6dc SHA-256: dca6b21169cf2ea60e47c8a0841bc8db20f6e6661bae793be575a7cf8cccc1ad
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, specifically utilizing WordPress upload directories. These links likely serve as lures for phishing attacks or to distribute further malicious content. No scripts were extracted, and the document body was unreadable, but the heuristic findings strongly indicate a malicious intent related to link distribution.

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://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cca13d0a37---fujabulovapexigexasunurej.pdf In PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9ffe25480---tepiramenuropij.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d733ae8e87---mivemigozukemesaf.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/wuwabu.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/xoxevugubepasubivazafet.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c97e022883---43424255851.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/deranupowisefujegaxewul.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/f43n7f8qvs3p8h1gb9ni4odgve/vetasubewufedexidix.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/20fab0e4ded238bfd9f1098b92b7e823/37420374088.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607074204373d---56423294325.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/83901712786.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/gumokefiwebelopelebik.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/sovufolevifumapaxaribidi.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/a3a7ef4a2fed2048dd9d8e8fe41a7d8c/mizopoji.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/82621714397.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/zekisorawidigubake.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9ff6415d1---tozalaza.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607e013647338---37709946531.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/baeaec85514d7d6d4def298bf79e8793/10203992067.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607802ab466e4---fitakimivetigitiwe.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c3966fb9d68e9a702e786c383d8c76ea/23272232372.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/d51832449f560cccd84faf6fb6970211/ponalavugiriximigawag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=flu+shots+available+near+mePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE245 10656 bytes
SHA-256: a4b7f8cc72b0ca03e23199c907d23d2be8460d11cb1c2c89e55c78c26263bb82
font_01_sfnt_off0000fa82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11294 16704 bytes
SHA-256: 5b80351975818e18ccbf464f1faaed9a3465d9431874c949c11052ad1b7f1771

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