Malicious PDF — malware analysis report

Static analysis result for SHA-256 b79a168626d89912…

MALICIOUS

PDF

86.9 KB Created: 2021-09-08 05:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fc545195f84623c645fb3efe054032d0 SHA-1: 4e227e2d6b7a720a33596af1e709df743867b0b5 SHA-256: b79a168626d89912e185646930e2007a2927ce4790dc0b46f74fce714c91eff3
176 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and IP addresses, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74661e9ec1---nakuvij.pdf PDF link annotation
    • http://lafayetteconnections.com/clients/52818/File/mufofojapu.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff9ae58a87---kitotogibokobe.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f1b01da8f---99383766499.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/54778931213.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/be5f1b1dcbedb2b613d41a0a4c02d9dd/kigipupebifu.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/gioi66adj6fkcv3d568193a9s4/pugivonujufefapizezo.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/d16330dd44d2d9f201abf80cd953850a/witepuralevupekevedufu.pdfIn PDF document text
    • http://camonetinternational.com/files/file/noluzepumetepabugano.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/tazurebekinoxotefiwos.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/73b98f5a75f8e7f922f99a5cff58fe4c/vesufuze.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/15673258172.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c322f6474a---93783719385.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/97861830978.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/pobimibuwafetebo.pdfIn PDF document text
    • https://ka-base.no/images_content/file/74419444828.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/bujosuxisilinoz.pdfIn PDF document text
    • https://jaiminsales.com/ckfinder/userfiles/files/6962691491.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/f3fbc3939bcaeee3e2977cd1df5799e2/safukolodepege.pdfIn PDF document text
    • https://theipbuzz.com/images/file/pifatijad.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/73c20f17c2decb8f026d9cc6be64842a/wemibuvododokokowa.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/kalirolun.pdfIn PDF document text
    • http://islandpointfl.com/userimages/basudeziwolomupudomiko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=honeywell+homexpert+rondostat+manualPDF 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_off0000e9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F4 10956 bytes
SHA-256: 5056e54dc015c16f199f0af6825592391ad94c1c61f9108ef02539df98c43fd3
font_02_sfnt_off00011b35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B35 18816 bytes
SHA-256: 6cdf6d1bd261a697354ae293a460eb06d28f62c79c80fbb03f0dfe3ff8739e7b

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