Malicious PDF — malware analysis report

Static analysis result for SHA-256 65de6114a1d9ead6…

MALICIOUS

PDF

95.4 KB Created: 2021-07-14 09:23:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 623c55c4449bb5ec5a969bf391c430e8 SHA-1: f7ea331e76d138f1fa90e380d231096854a31c65 SHA-256: 65de6114a1d9ead664cb88914b0ea173fcd36a1dfaa4b2e8cf62bf42ed3a0569
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/298e2abb44406337eb28bb20c9aa2f84/51760079179.pdf In PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/gvmclsk0ii82dq5dl24sv3d217/pumuwufuwarugowolijimiki.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/63622393082.pdfIn PDF document text
    • https://petala.gr/userfiles/file/55982631476.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/526baf941541a9c96d12fd00aed01610/gigesek.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/sotakiviguwafez.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e014b529e7---tezafugilipaxu.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050208122873499.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/mutenimabakerijobup.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b50a7dcf2---zurafefo.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/52903533914.pdfIn PDF document text
    • http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/faxupo.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f10a3b207d---bazuwitufifiwamipexosimo.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086564f98eaa---18811526189.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/25164409905.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/64177261116.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/7afa61d5571acd0ea22fe47404c0e3ad/21503341923.pdfIn PDF document text
    • http://piau-po21inn.com/CKEdit/upload/files/39716753150.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/6fef3884c9fa04cdcac9aa8acef45a22/92459013307.pdfIn PDF document text
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/lanigovazoxigesiwutupaz.pdfIn PDF document text
    • https://fancli.com/1vsz35In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=laxmikant+book+for+public+administration+in+english+pdfPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/17173811423.pdfIn PDF document text
    • 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_off000102be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BE 18560 bytes
SHA-256: a3e73786ec672f634baaf4cffbb391628d1c718debe0b80e7c9007b38ee6b311
font_01_sfnt_off00013448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13448 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014c5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C5F 11456 bytes
SHA-256: e4f2f0aa01bd3b9997a68654fc6f5455b185100c9bdfdd1dff6b6a46ad934800
font_03_sfnt_off000166ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166CA 1900 bytes
SHA-256: 1b006c407589fc9252123cc51eaeb5c6904db82ee47faaf52b2727a7571a5fdd

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