Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c1dea95baba68f…

MALICIOUS

PDF

78.3 KB Created: 2021-07-23 01:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 30e13958d92f4bdf670eee2e35da2820 SHA-1: 53d278ee0ae2e4cb4d342c0e61ec4b413096236f SHA-256: 85c1dea95baba68f26b0cd6dfe3c1b29afb147e831bce438853890efd3ef6696
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, many hosted on potentially compromised or disposable domains. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests the document's purpose is to distribute malicious content or phish for credentials via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://biothiennam.com/media/ftp/file/takugadugowanupeguluko.pdf In PDF document text
    • http://wajl.net/img/file/202162511444.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/fomaji.pdfIn PDF document text
    • https://personnelcle.com/userfiles/file/burilal.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/34042285171.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/661b05f7387669890c626c7174986c10/tapizabegojelajasopofijed.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16091d984b682d---duvubosuwitetexoputitogig.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16073a015204fc---nigadetobidogoju.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/95998375953.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/32d1680f307d5b0d52862b9940d3a64a/96657981439.pdfIn PDF document text
    • http://blueyee.com/upload/file/300326331902.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094182b64555---seked.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/86974413777.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855bfb80d7b---gevadirafovela.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16078f110575aa---83136063591.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/vukijep.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/vulejipoluf.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1622682235.pdfIn PDF document text
    • http://xnkvinatimex.com/uploads/files/razuziwibifupiges.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/202179197195584.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/wemawaxinunifubimugomez.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/77315572222.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=suffix+for+vomitingPDF 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_off0000d314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD314 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB26 16124 bytes
SHA-256: 65e1ef16948b568b48e127e7d77490ee5dd81bd82d15fc380ec4e7ff3fc93750
font_02_sfnt_off0001149d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149D 10392 bytes
SHA-256: 855ae6c4a373de405040f5b7064761a30488197c3a1577b08ce625c92e9178dc

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