Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ff19f863e6f106b…

MALICIOUS

PDF

81.8 KB Created: 2021-09-04 09:17:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5f9b7ed4ce272dba75edb37b7e13c60e SHA-1: fc88d1be18766a5bf49b73a39152b216fcdbe4fa SHA-256: 3ff19f863e6f106b51c4c22e2ee8187b997ac974cff901964f2e5126672bd025
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a link farm pointing to numerous domains, many of which appear to be compromised or disposable hosting. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, consistent with callback phishing or tech-support scams. While no scripts were directly extracted, the ML classifier strongly suggests malicious intent, likely involving exploitation or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://philabc.ru/uplcv?utm_term=4.3+exponential+growth+and+decay+worksheet+answers PDF link annotation
    • http://ceraunavoltapizzeria.it/userfiles/files/59688162946.pdfIn PDF document text
    • http://thecargonepal.com/userfiles/file/suvumomozazisaparebelesif.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160e2baea8a635---tedot.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da136a6016---98543742598.pdfIn PDF document text
    • https://daiichigroup.net/uploads/news_file/2593334340.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/96284289866.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/22cf78f2786daf2bd58f226ad806dff8/gigosulejivat.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/73032370095.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/960c7b643deb533bed55a5812e254c42/97171140811.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/987d753a2635f3b7c08949b56f0961cb/74522030173.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/37485776849.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/66tdpivts4i26m10uvbsr155u2/59697577448.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/60589027727.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/90464767616.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/47959107983.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/o6ah4sednavioebcvgs0qdcpc3/18208627797.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/08324d41cde6951ac7cf662a95d2c27a/73170577111.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/1ce83684804c7824c166280405a82456/48365976750.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/wujezosajaxijusaje.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d51ea7eb12---10123389497.pdfIn PDF document text
    • http://bangkoksolarpower.com/syner_upload/images/files/wokopuwigemaruruvukaxita.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16111114a5b6cf---79507406908.pdfIn PDF document text
    • http://gfzgt.ch/upload/file/wilesufidanezedabijeviga.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16089d36a72fb9---ravirir.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C8 11404 bytes
SHA-256: afb14249db603ebcbc1322e5a3e1c7cef11661eb326d54f34170b40849e25efb
font_01_sfnt_off0000f08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001089d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089D 18460 bytes
SHA-256: 5915692535dedfadc2590656d8c3b177b7bec4d0fb2d4ace5f11131e04804eac

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