Malicious PDF — malware analysis report

Static analysis result for SHA-256 76f9040bb5699e0f…

MALICIOUS

PDF

71.8 KB Created: 2021-09-16 11:06:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 13cc6316ab9120619a3502e472ba4e37 SHA-1: 2ebf8ad6cf49e3339c3ad1c84fb1132639de006a SHA-256: 76f9040bb5699e0f8d72b6876c8deeffbfdf7f37afd747901c3ce57a75b63ce4
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple link farm heuristics reinforces the assessment that this document is designed to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://smidgel.ru/uplcv?utm_term=5+differences+apk PDF link annotation
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/fe1bc01b4e0aa6bd0dd4fdb2df6072e0/24136937952.pdfIn PDF document text
    • https://sledovani2.gpshlidac.cz/www/userfiles/files/kogikijuxazalevaxet.pdfIn PDF document text
    • https://fuoriscena.eu/file/46298540542.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/bikegowokafiko.pdfIn PDF document text
    • https://nevisnews.com/userfiles/65930005252.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/88993035272.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/90181526265.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/besujokakumozitan.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/2335744152.pdfIn PDF document text
    • http://888chji.com/userfiles/files/5318179434.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/161351a04133da---kodebawofepubofisade.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409fc2678fa---51451626932.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/98757273498.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/26314922839.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/69100303282.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/42598758781.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/moduzewozut.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/82744676645.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/47467885732.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/63057186503.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcead0ef01---sosupejat.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/tegalexogikepujixedometul.pdfIn PDF document text
    • 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_off0000b957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB957 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD169 16004 bytes
SHA-256: bf592b810bb704920b70580297300a3e88aedfb04add1a70a9d842655a4aaaa2
font_02_sfnt_off0000fa86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA86 10480 bytes
SHA-256: af305a1c96ac80a9bc04defbd4bf6dfbddd86e292c926c86cb5b45bf532858b9