Malicious PDF — malware analysis report

Static analysis result for SHA-256 75dc812e724b9ef2…

MALICIOUS

PDF

87.9 KB Created: 2021-07-07 18:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: ffa344e33b0b8720d9666ec0a70f1e1f SHA-1: ad9198436902ed4b48be646af525bae80ebf5121 SHA-256: 75dc812e724b9ef2f58494a761a72522274dfd1667e1deb9234eb7ebca4235d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • 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.
  • 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://kaithompson.com/userfiles/file/87516539872.pdf In PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa665d6028a---53721350579.pdfIn PDF document text
    • http://jkphotocon.org/data/userfiles/files/14239875011.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/gojawew.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/4f856e79c2e21611e48cd7f98c475627/20029140718.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f72564525c---sawoxogajowalidif.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/ef69f56fd68d22369ca609197edee1b3/77334811173.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/jeregebukilosigorurege.pdfIn PDF document text
    • http://widepolymers.com/userfiles/file/37403166899.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7d6768dc5---1713197660.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/90248024665.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/7tfb1se0es6op8moira3gph5go/punozexutev.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/4636aa233e193f9ccad0a8cdaf236ef8/61532112498.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/87279805291.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/12537715613.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/19ae6cac851bf657a44d2172b56c5086/tuxal.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/42353799762.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdf5e684a37---68180224884.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/55018729682.pdfIn PDF document text
    • http://lucann.com/Upload/file/57147013415.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/gefonelufopepipozutalek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=heuristic+problem+solvingPDF 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_off0000f344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF344 10852 bytes
SHA-256: 45236b00ac28fc76aaa89e7790d17d8ca8393d5d22cb018b7a09cc6ceb9f3533
font_01_sfnt_off00010c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C10 17708 bytes
SHA-256: eef4667eb175c05f132f7348162f2faaad3b0a3d98723438be5c9f61eab20550
font_02_sfnt_off00013a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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