Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a7110a2b060d1c…

MALICIOUS

PDF

84.8 KB Created: 2021-07-05 04:42:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3651cd2033692d6d36d178b017624c43 SHA-1: 1c0f9e830e5fbf3763d3cd70461be6a86a0da42d SHA-256: a4a7110a2b060d1c777e977a38cba9faf5a58d412f838e8ca3274d36fa53af2e
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://chcial.ru/uplcv?utm_term=find+past+perfect+tense
    • http://paynechapelduquesne.org/clients/9/9b/9b910c66cef3ae2d1bb1fd5804160a19/File/36695808698.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ff60366b7---26647200057.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608365b333975---923867413.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d90484e2356---zefujipegeki.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1468c80bc---75991448985.pdf
    • http://kancelaria-perfect.pl/app/webroot/media/files/60120804663.pdf
    • https://szekszardportal.hu/userfiles/file/22896601292.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/d855g6ma4agvdl4mg05if95l4h/47866118004.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/6fbe333e366d13963eee9e096726afc8/fomozerunitab.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd507ccf92---gevalazazasomupimuwaket.pdf
    • http://ypperfect.com/ckfinder/userfiles/files/34582478753.pdf
    • http://karunb.com/UpLoads/files/vijerisozetorukadexigexob.pdf
    • http://ajtoablakcentrum.com/_user/file/kakowowotutujinam.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/p1ue91ilk29og0nml5u4mdtk29/1290723146.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/97769ab5110c011708c0754b92f6c631/bikewalolabinewarojewuve.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/abacc52be5137ef70e99286f49c7a68d/86218710138.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/1766454100.pdf
    • http://perles-del-beya.com/userfiles/file/29426305144.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/a7cb6fb0bba7994dfb094700fc076411/80679589376.pdf
    • https://sasalidayanisma.org/uploads/file/woteviwamovupuluvogujopud.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/41c51aa468130860005e80a97a2e0c89/vepugawaxolupufos.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/8e386e17ef151f0aadf4605ea34c3dd2/66166474674.pdf
    • http://autoscuolauniversale.it/userfiles/files/vepuwumu.pdf
    • http://katyababash.com/images/uploads/file/salixamudesodotubop.pdf
    • 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_off0000ea35.bin
94371367b8889c5a4ebe312d846b4dadf0b834615891b8b407d340d1bcfd2a11
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA35 17108 bytes
font_01_sfnt_off0001163b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1163B 16792 bytes
font_02_sfnt_off00012e52.bin
18604691ad4f1296d19d61f944ef0c8e53e3109b632875109176d0622cf023c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E52 10424 bytes