Malicious PDF — malware analysis report

Static analysis result for SHA-256 640129105061899f…

MALICIOUS

PDF

96.4 KB Created: 2021-08-06 20:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ffdd8da053686ca07f1046d5fd27bd07 SHA-1: c25bc8e021bd5a40a1914bdf56e1d728b8911bb4 SHA-256: 640129105061899fb029dea730209fa435c9ece859e8a5c60587334a05ec5a09
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious content or phish users. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, a common tactic in tech-support scams and callback phishing. No scripts were extracted, but the presence of numerous external links and the callback lure strongly suggest a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://wijnhuis-vaessen.nl/site/data/ws/files/16047879571.pdf In PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ob1541goststp1aucq0njvbluo/wotabidutizamodasa.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210620150051_cou7x7.pdfIn PDF document text
    • https://airbays.com/userfiles/file/varajikokekuko.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3e0f8f4c2---refenig.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/02ab7fdadd912b314f468bdf25963316/senamogar.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607d12c762a91---55244725819.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/72982673959.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/57228103713.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/78016006344.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076dd597ec94---83522542093.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc026eb7dc7---rokubiridan.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/nuvotusogekekakutukabana.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac994be57a---89841477622.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/62ab62054717b703aaf8c72a9d286e5b/10985132719.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa651f8c3e3---kopilenojakujiga.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/24250ef1a0939252ae4348da71b689c3/razaraxoposowiki.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/2n7ug943gvq47c2bdmr2qu23gt/dewuwe.pdfIn PDF document text
    • http://smartcevent.com/clients/871459/File/91750137561.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/cm5regdoasljjpqbtmsrtcianv/jigokal.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/scdrh0a16n6p0pdnc8cn86rmp1/13788725315.pdfIn PDF document text
    • http://winso.tw/userfiles/file/20899420103.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+many+questions+are+on+permit+test+in+indianaPDF 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_off00011202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11202 17400 bytes
SHA-256: e907678aa95826a6ece658c37f82526cc35051d1bcf68a07a442fa985fe7c38d
font_01_sfnt_off00013f59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15770 10944 bytes
SHA-256: d7c598a21bd881d30c0de84c9cfdf590c1005d2ab423bbcd5d3f1df51df92b9a

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