Malicious PDF — malware analysis report

Static analysis result for SHA-256 c28b0409773bf85e…

MALICIOUS

PDF

98.4 KB Created: 2021-07-07 20:37:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8d24707d6f3cdc22f515d2c6bdf27674 SHA-1: 3df8947d5e0aed9c47aaf750eb09ee2585919fa8 SHA-256: c28b0409773bf85e0369e6a02e4288307a570b2552a3f0d9a38a19ce166f54fe
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious content. ClamAV and ML classifiers strongly indicate maliciousness, specifically flagging it as a phishing or trojan PDF. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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 https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/6c46beff2c1e41579017ba9acec3bb75/wazezafevotogadi.pdf In PDF document text
    • http://pokemom2.com/uploads/files/gumaxos.pdfIn PDF document text
    • http://blueyee.com/upload/file/191917433005.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/b693cef09e89244d196e0eaf94c59b30/zuzawukojosobigovasovado.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/2729136186.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607537ac4b695---19083074961.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608543f59ff1a---49817297109.pdfIn PDF document text
    • http://gistfamilyreunion.com/clients/8/8c/8cbf0a40baaab9dd4734ff2cdbb1e120/File/39186061217.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/kelub.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/n4m9h0sksk19pah77kv048ba2s/xifex.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/af353094ee76dfdb496e705fdf3c029a/87849352990.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/qc3b847h1b825b309eo2v2muv9/wiliwivud.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/13842432247.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/sp6ctggknbj7b8d64ka534hu62/bozen.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/rjamoclg61tvfudeomrdtrtkaa/42249831836.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/54022729600.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/sibowidaredirinemefavo.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/d810b0d5ea3163dcd067d6eacb3473c4/fifobano.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/puwikiz.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/76069825408.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b441337c5e2---59242804568.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/qggp49r1g0oo67topc32q0iu8f/badurumozaliremi.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/78295627053.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b99ec78ad5a---jopamisesirerowukajoruk.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/df41818d80e7d46eae656973d03845ee/winixusuwiwuzebezosiza.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070c04ad3ced---lidotim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=tonic+water+and+quininePDF 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_off00011dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000135d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D5 18120 bytes
SHA-256: 1a25b65b3f7483193337f37b84276cbbabc04dc9dc77fe5ae3e5e87939caa7d8
font_02_sfnt_off0001647c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1647C 10444 bytes
SHA-256: fe3fcc6f3b19144833949becbf8d1fcee4d18b6ce10440a5e39c26291ce42712