Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ce57b20d1a6616e…

MALICIOUS

PDF

80.5 KB Created: 2021-09-11 22:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5616b214dee97f7bc6b5f441051db3db SHA-1: f71fad70f08ee86b2a45d0a658f9f339354d0d85 SHA-256: 1ce57b20d1a6616e8034d58e4bf992833b0c7a6762c7007395265c6929931ddf
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, several of which point to compromised CMS upload directories, indicating a potential distribution point for malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links. No scripts were extracted, and the document body was unreadable, but the heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ivankotov.ru/img/lib/file/jirok.pdf In PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327be5b5938---kofoferuzamodiburexesad.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/luvimezere.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/wunakabanorosejakogidup.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/dagumexezalofirozofosis.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/2d5d6eec0542e621d73d4d01d3bbf949/38108133301.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/26659955934.pdfIn PDF document text
    • https://datajournonepal.org/files/nutezumerimuwujozoxon.pdfIn PDF document text
    • https://papiratisk.cz/soubory/78745535161.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/76509185552.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/ripizuzulizi.pdfIn PDF document text
    • http://cosyromania.com/media/file/lofajolalu.pdfIn PDF document text
    • http://dautuck.com/uploads/userfiles/file/jinubodifoburozaj.pdfIn PDF document text
    • http://melabo.com/upload/files/48022672435.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/74569928783.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/jizebetasezujitexadovojud.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/livitedogikevixakaloteki.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/mavegaxilijuxozajifojo.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/36077647043.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/supokoxajovasedirodupowo.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/38487944661.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138096995250---60680585082.pdfIn PDF document text
    • http://satyamtracparts.com/userfiles/file/70589542369.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/51814553387.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=dark+souls+3+randomizerPDF 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_off0000d769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD769 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7B 17216 bytes
SHA-256: 7a77868903de3869c6d6b91a73e579125b3a29e9026c662a15d325913bfcf65b
font_02_sfnt_off00011baf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAF 10736 bytes
SHA-256: 298efdddab2ce598df4a5a2deb2bb1c3b598c12d9b17fcccd57cf1737fd74330

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