Malicious PDF — malware analysis report

Static analysis result for SHA-256 14943a28a150b5b2…

MALICIOUS

PDF

119.5 KB Created: 2021-09-09 10:14:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 47c59bf7f525f89b378c27328116bf3b SHA-1: d1e6276079e3eac258eda2e82f8823f3ed636615 SHA-256: 14943a28a150b5b2392f0dbb6e0c62bfafc4c8992e71011ab2209bf16029e602
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm on compromised or disposable hosting. The document body is unreadable, but the presence of numerous embedded URLs, many pointing to PDF files on various domains, strongly suggests a phishing or malware distribution attempt. The primary IOC is the URL hosted on a compromised WordPress site, which is a common tactic for distributing malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://kcharp.com/ckfinder/userfiles/files/sififijabomoporejolapoz.pdf In PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/mepuduxokegejetepus.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/sumujok.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16130ae8424d7c---resevajux.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20219518340555.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wevudedel.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/5593555681.pdfIn PDF document text
    • http://synphabase.ch/upload/file/44822220540.pdfIn PDF document text
    • http://edeins.com/userfiles/file/vibelifaj.pdfIn PDF document text
    • http://barexkft.hu/userfiles/file/40315434831.pdfIn PDF document text
    • http://plenerowe.kbo.pl/ckfinder/userfiles/files/selewenasugetivikixuleb.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/jukoxowamijobusopadugope.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613229985ecb1---mefepusujibukadasujorilek.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e4343ffb2---46690426286.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135bd00e7f73---29334723971.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/80413184934.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/sixivinog.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/83672409339.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/sivamefevonenilufifojuve.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/71711488048.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/52970438955.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136722b4c238---99740679797.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/gogikabitewufaki.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/futozumokaxavojul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=android+developer+hourly+ratePDF 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_off00017640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17640 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E57 10580 bytes
SHA-256: cf8f6122e8c3b4524543e64db06224c424cc7040f52a54c1bc802bdf9f139cb5
font_02_sfnt_off0001a666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A666 16236 bytes
SHA-256: 6ea59e0a33579f31eb4430b5f06524decf063fa86faaac5c28fd6fcfeed547be

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