Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff2c03dfc2b8d505…

MALICIOUS

PDF

87.8 KB Created: 2021-09-19 11:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 342f748250df3184d1d2921241785580 SHA-1: 84bb204973a3f6413a57d294c83422228e3125e5 SHA-256: ff2c03dfc2b8d50582c33e05035ae753b7e1f4a7a03267369f22e36065e8ccb0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users to malicious sites. Several external links were found, some pointing to compromised WordPress uploads and others to disposable hosting, suggesting a link farm or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://memo-log.com/userfiles/file/livakemagakes.pdf In PDF document text
    • http://krzeptowski.pl/file/56117138319.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/536e1a0b344d76a8e8a88c68c3b1fc36/rapijefefujapik.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zelodibevupakoxoju.pdfIn PDF document text
    • https://maviet.vn/upload/files/66750246080.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/rinunexopemofajug.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/54513076902.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/wivapexomafiwowizexu.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/feririkiv.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/95920309090.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393b3228448---jejava.pdfIn PDF document text
    • https://f2h63c2.ip4secure.net/upload/files/kakazuxilogebuje.pdfIn PDF document text
    • http://saydersan.com/firma/files/25847785742.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/a1928a6f64a1fa8d31fffd94312ee27b/11493861982.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/budevifazijofovi.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/97263267029.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/bomijezotuwazetefuba.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161400f48847ec---gobefujexizefi.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132522f4214e---14418207065.pdfIn PDF document text
    • https://cardolf.ro/files/71101666361.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/3a9eee2d206f3fc83e1f2cf320088177/84123082854.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3e8d2bf3a---33430783742.pdfIn PDF document text
    • http://fourfoods.com/images/files/wajodosamukipozawenadov.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/36643161347.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=game+zombie+terbaik+android+2020PDF 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_off0000f1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0A 10768 bytes
SHA-256: 59b44ec5895208eaf46982aa4195b5e722f3e3ba601143bd44254165ad840513
font_02_sfnt_off000122df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DF 17688 bytes
SHA-256: 76d3f972844ea40724764c43a7b21102ebbeb39947bc731e6dade3c26c007832

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