Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c5bbc4c0d278147…

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 21:31:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3843c77416c58c6d27b4d64a099dfb28 SHA-1: 9caa3541c8c60af0633268250c801d7358411a49 SHA-256: 0c5bbc4c0d278147437e50ba3e7d2a9e9d7a45534dc5949406f396c15f21cba3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to potentially compromised or disposable hosting, suggesting a link farm or phishing lure. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML score further indicate malicious intent. The document body, though heavily obfuscated, is generated by wkhtmltopdf, a tool often used to create PDF documents from web content, reinforcing the idea that the embedded links are the primary mechanism for attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://mimpi1pusat.com/contents/files/34485607184.pdf In PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210904_014302.pdfPDF link annotation
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/46652382648.pdfIn PDF document text
    • http://skncn.com/u/files/radipovozepapofoloj.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/farebelurumatitige.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/94328085757.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/7707406755.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/sko1rqbkkjsfdv3q6k0os1uepk/41371278759.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d799de25f---pajiwe.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/mm0j4greef0ir0iaamog6s2cep/davozawimujogidukupebi.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/86930509299.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/a67905d993e4fab04c710a014fbfcb52/51455626816.pdfIn PDF document text
    • http://gurolmumcu.com/userfiles/file/wopodudaduzef.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090800184818.pdfIn PDF document text
    • http://koddous.com/userfiles/file/patodivosegulib.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/gusidigifuniwonadoruk.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402bcaed603---girilalevaworede.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/pimupijogupewesezasitini.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/f2dba234b71969397a42f24862eafe4c/topabemakiz.pdfIn PDF document text
    • https://parfumzone.ro/files/file/6780455142.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/zipemojafurabo.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/82579844242.pdfIn PDF document text
    • http://cosyromania.com/media/file/daliwasaratisagupukivog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=sat+practice+test+1+pdf+answersPDF 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_off0000d9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F9 17780 bytes
SHA-256: c48e6a87e066d483a3a00ef81444edb5d31914efadfb327d446e4d982f43652f
font_01_sfnt_off000107d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D3 10660 bytes
SHA-256: e9df44775c0c3c46397d2de525fdf59d6949d672fd36df20759852d21360f5dc
font_02_sfnt_off00012077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12077 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1