Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4165b4a5b64bdc7…

MALICIOUS

PDF

85.9 KB Created: 2021-09-12 19:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: eb6841fa35f3e17d711af13b3e6d1896 SHA-1: b3977449dee8fc91c8d6fc90419d91a5bb2b6dd3 SHA-256: c4165b4a5b64bdc702aeb6c85bc112a4ec3819457250708646f7bccb6d668b28
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites and IP addresses, indicating a link farm designed to redirect users to malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ClamAV detection and ML classifier further confirm its malicious nature, likely serving as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613da927016e4---87894400486.pdf In PDF document text
    • https://keongracun.org/contents/files/bamujabadalesopunulutasu.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/0fcd583c6c0fdfdfe8fbb10437a1d8c9/39928967245.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/lubelizigasezukebedigu.pdfIn PDF document text
    • https://seerupit.dk/assens/file/labulepiw.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/gutumu.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/38386318638.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d410c2da0a---segedu.pdfIn PDF document text
    • https://autoskola-scp.com/files/vevewawedof.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/sevorofezupaziwujipiwum.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/jusimapupe.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/kibasa.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/32284300866.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/de498b3889567ad814b09e830f7f946b/52935966172.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/lusiwi.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/pirekixolewasinixaxixenu.pdfIn PDF document text
    • http://caydinhlang.net/userfiles/image/file/fulul.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/90798097559.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/dujireboxub.pdfIn PDF document text
    • https://westhygiene.hu/editor_up/33797756589.pdfIn PDF document text
    • http://bptramptour.pl/files/file/newefidapi.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/93906356941.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/54358312428.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/wexikajesuri.pdfPDF link annotation
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/wujazapemomufagizexepe.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210911_152805.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=screen+recorder+without+watermark+android+downloadPDF 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_off0000ea3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3F 10820 bytes
SHA-256: a0edc5fcab0e3640501989b1c84f6649afd8d29d995244bf36861303f7d74510
font_01_sfnt_off0001030d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030D 17972 bytes
SHA-256: c9e1d4eb5b48b3987d4dee658e1a65ee34551810cae7903fe8e40ffdd5b87b44
font_02_sfnt_off00013147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13147 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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