Malicious PDF — malware analysis report

Static analysis result for SHA-256 b57361ffca584959…

MALICIOUS

PDF

76.8 KB Created: 2021-09-18 04:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 618698f049341b64cd209a9916d42a7c SHA-1: 2136794fed6a49b7d64d42a8595fce3880b58068 SHA-256: b57361ffca584959c6c30d27e907435f87ba78de26539e180c3447c3dabd4a09
164 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 contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The embedded JavaScript likely facilitates the redirection to these malicious sites, contributing to the overall attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=top+20+most+populous+countries PDF link annotation
    • https://ice-group.pl/userfiles/file/tewoliv.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614379e99df67---5845446603.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/xijedib.pdfIn PDF document text
    • https://wsbtitan.com/images/file/14980769961.pdfIn PDF document text
    • http://sinoorchids.com/image/file/vitel.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/77380650388.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16141be55b0805---24239014499.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/gilusoki.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/52893017483.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/cf9816776dc9b0150b55d91ae0d83286/wuradukorubugebuvitirufox.pdfIn PDF document text
    • https://gameadvisers.com/js/new/fckeditor/userfiles/file/gizunuxatuvudazemaregis.pdfIn PDF document text
    • https://thegmsbihta.in/userfiles/file/kuvigipexetaxepukejopolul.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/76316601960.pdfIn PDF document text
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/dibopivaxerujevirado.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/ruxexidimixa.pdfIn PDF document text
    • http://kvrhousing.com/uploads/29882291059.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/aa9074f53882861ae71b5f60cdc4a861/pimefuganubi.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613695cfa766c---bikurenakoguwiv.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/3914544432.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/55598021578.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210902_135148.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/tewawususozepinagoket.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_off0000c78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78C 10676 bytes
SHA-256: 70bccb17a50334020b18c58150dd28c6a65fb44b987a80990b717c125c63f50a
font_01_sfnt_off0000e00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81C 17572 bytes
SHA-256: 2416f366392809a13973c04ffdbf753bbb87835827ac7d5562e19189bf4e0763

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