Malicious PDF — malware analysis report

Static analysis result for SHA-256 4742e1b6d04e7c1d…

MALICIOUS

PDF

69.4 KB Created: 2021-09-27 13:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 01d87126491722410068b43d41427a39 SHA-1: f17543034510fedf0ba7bec71da224e1bf8bebaa SHA-256: 4742e1b6d04e7c1d03e6760bb9baafd1a8d8a936f91f537175d666ee88d9d623
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. While no scripts were explicitly extracted, the nature of PDF-based link farms often involves embedded JavaScript to facilitate redirection, suggesting an attempt to lead users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://millersexpress.com/userfiles/file/bukunikuberewumuvitizamig.pdf In PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613335a486ff0---25828007556.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210916_235304.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16148ff6e82b08---54955849467.pdfIn PDF document text
    • https://bayihoki99.com/contents/files/61673220349.pdfIn PDF document text
    • http://chenruichem.com/upload/files/fixodibitivo.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/20734133013.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/31923173564.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/31826451767.pdfIn PDF document text
    • http://sjhtractor.com/d/files/25785539301.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16149a71f6a631---10943730752.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/42406740184.pdfIn PDF document text
    • https://bfull.ru/uploads/files/43328008140.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/wepawovomonag.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/takutopopogonevag.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/91127277160.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134dcdad78c4---19759506249.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/38393336071.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/27383212640.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/mibizuki.pdfIn PDF document text
    • http://cycling-software.com/files/file/nilabedumovipusefejakavar.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/91794774390.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=farm+frenzy+2+for+androidPDF link annotation
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/6135107698.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_off0000b16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB16D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC984 10472 bytes
SHA-256: 6bfb7d345bf1cebf410c25441a9ea0744965e2b95da1e64bdb6ec561353e2723
font_02_sfnt_off0000e159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE159 15264 bytes
SHA-256: 0509af0edb1bc35f3116985149a3fc1a623eb454346b524fef99ee7432fbf201

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