Malicious PDF — malware analysis report

Static analysis result for SHA-256 077ac00396bef2fa…

MALICIOUS

PDF

106.3 KB Created: 2021-09-04 00:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9910183db89fc938f9bfba544b246aa3 SHA-1: 96c07d2dd20540a0215410778185f93814cba28d SHA-256: 077ac00396bef2fad0b0c78d25c1a661369c62ba6ed782b2a1c8d86ed7bafb8c
156 Risk Score

Malware Insights

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

The file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristic analysis revealed it functions as a link farm, pointing to numerous compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and link farm indicators strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://yuanjen.com/ckfinder/userfiles/files/48333066199.pdf In PDF document text
    • http://meta-min.com/files/sinediwexaripuxerori.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcc47e9014---tuwolefimebu.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/3015449137.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160777f1a28a3c---misuzor.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1625577321.pdfIn PDF document text
    • http://jacksonreunion.org/clients/71346/File/rabedivavagobel.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160f974cdc443c---86159917583.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/13174001490.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210703150832_rwdu0o.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/17846442912.pdfIn PDF document text
    • http://1960ihs.com/clients/e/e0/e0b58928a48036c9af8d6cfc9cffdd99/File/76592953649.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/7l4sqh32uujg02u74h2q6t0ii0/folujefelarafimusar.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/67771868613.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/tigexibesedazofoteloto.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca9dfb6adb---tugesowutapetidez.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/eaafda6940102eba87f67c7da33a3dc6/43668554843.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/80210082914.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/ff7d8ef4000bee72876b2bcb53bf2836/19440250997.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e947193326---81432888965.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021062903510816.pdfIn PDF document text
    • http://frappsreagent.com/upload/files/dukikesu.pdfIn PDF document text
    • https://85097781.com/upload/files/52110026273.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084810f6e670---44024881250.pdfIn PDF document text
    • http://itena.si/uporabnik/file/zopalivonuro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=steam+engine+report+pdfPDF 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_off00013a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A6D 10700 bytes
SHA-256: 64c4201e4f8d75e111751e6b01e981d51834349293e068bdd3202efd07991a50
font_01_sfnt_off000152bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16ACE 18884 bytes
SHA-256: 181185045e3f89decbfeb573666b8493d8b868b800fa5c972a5529921f97b16f

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