Malicious PDF — malware analysis report

Static analysis result for SHA-256 5338f986e4056fc1…

MALICIOUS

PDF

96.9 KB Created: 2021-07-22 07:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b5b4aba5afb3109fff421bcd4e91eb22 SHA-1: 415606eb3c43212c7a2ff0d804948fa5d2c1c11c SHA-256: 5338f986e4056fc113913c4a27038fc03b8d12a0158ffc50d672f72229d06b72
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection. It contains a link farm pointing to various PDF files hosted on what appear to be compromised CMS upload directories. The presence of invoice and callback lures suggests a phishing or scam attempt. While no scripts were extracted, the structure and embedded URLs indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://securityguardsupply.org/php/uploads/file/zipefagapevovekekexu.pdf In PDF document text
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/39182813311.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/63653672002.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/b125a11b7e8f7ac28a27b7bbf676e9ce/48571370678.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a81fefa0c---64845960577.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/5rl732b5ajqpp751726teqjtj3/zigafadakebed.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/mopebodumoxepav.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/uqfvn1ghu86atoe5a4p4jhhmv0/86139196599.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/tosotujajexujoposa.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160a86b4571907---sujolovo.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/taresesezajaxaxew.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/katabotovutatijofavuf.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/84d2ac2b99cb91e3b6ef1c71d9cdeb54/zopimonajowesufijar.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ca19921257e---tubozeva.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/5khfm5mnpstekavg4kcte3db26/valalirodotuwim.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/2e2bda6691fd5480551745eed71e0883/fetozipajoren.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/53d978d30cd5a8739764aa48a5e58c22/28510282108.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/o6r38os6htl7kn6ap2qficlfn2/39468486872.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/65415633342.pdfIn PDF document text
    • http://614move.com/clients/4890/File/bovikonuxudosuwiluwerizu.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086fd2b68b21---68569344787.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=us+mail+return+receipt+requestedPDF 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_off00011718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11718 17200 bytes
SHA-256: daa5397a9dc4b5c98c88861d596d147250d25b85df42b87e1511ea6721448c36
font_01_sfnt_off00014451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14451 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015c68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C68 10808 bytes
SHA-256: 5ba5eb6c9e080980190929533cbb68be2820ec15e24671ea84e041698cf55361