Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c51a41004f6b9d8…

MALICIOUS

PDF

80.2 KB Created: 2021-09-18 04:26:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 55764b3d527ce5e8a0c80798712a1900 SHA-1: 69f2b8917312a7b2df6d0fefc06ebf8ce0be245c SHA-256: 1c51a41004f6b9d82894f7d32572a6c677b866823f4e352e2ac05f0bc9ca1b5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous URLs, many of which are hosted on compromised or disposable domains. The ClamAV detection and ML classifier indicate malicious intent, specifically identified as phishing. While no scripts were directly extracted, the structure and URL distribution suggest a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9764

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 http://unitec-egypt.net/userfiles/file/50476198300.pdf In PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/rololumesagagevojojopip.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210909054818.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/85976358410.pdfIn PDF document text
    • https://telliogluhukuk.com/userfiles/file/66584938877.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/82426505937.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/fozolinu.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/lebebivusezemuli.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/81998023781.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/konuso.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/6ee5cd5724b37b73cd4cedd34e68d5cb/54216951944.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130aee000844---58160847086.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/jerawoxemi.pdfIn PDF document text
    • http://beganijewellers.com/ckeditor/ckfinder/userfiles/files/79364090568.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/14840108794.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/vomibunixiwepije.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/wurajugujigovivenofomoduw.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-9/20210909064905809774.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/62699185659.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7a335d149---90694158621.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fab4b4e722---54957637926.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/35034543386.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/84080490248.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/69537347597.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/tibimo.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/60132198561.pdfIn PDF document text
    • http://infas.cz/images/wiswig/file/sivelusuvobu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=baixar+photoshop+para+android+gratisPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC166 10648 bytes
SHA-256: 3253414b519ba494cb2717b48d6d7533848626b35aa2f8c308193e899ebf9768
font_01_sfnt_off0000d97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97A 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_02_sfnt_off0000e172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE172 22712 bytes
SHA-256: 7e021be52a97c9ebcc7d27a72548e756a5916cd834e338d368a44eda708fb305
font_03_sfnt_off00011a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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