Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dfbe849865ae118…

MALICIOUS

PDF

86.4 KB Created: 2021-07-04 17:56:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e2c15d48d970b867ee1063ee7a5157c8 SHA-1: 9221c021f42c84b14d76ba7c5fd4e8953a01e7b2 SHA-256: 1dfbe849865ae11897b9b1d2bbc2a274ef7fd852f85fb5b6aad5b3798523437d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload directories and disposable hosting. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to facilitate the redirection to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/dae0f1fc1ffda71719a3464708c71c56/67333554811.pdf In PDF document text
    • http://biosurfest.com/userfiles/files/kepawomaxoviraxatikefumu.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/30750555611.pdfIn PDF document text
    • http://aquatrustfina.com/userfiles/file/lisunudijunemepivimuf.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/9c9fec864d3be794ef42841dab50df42/57043562095.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8aad612e3---miletidowigububobodegabu.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d9122eea9fd---gegosikeripalobijelubebij.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/jasogarogunax.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160920e37f0178---doxerizorupodugix.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748e19a823d---6786024412.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/71547226731.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/63d7ed47f0facefd40aff92b7660e920/7045948324.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/75917299313.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d53978348b---jikoxiwimefafesoduxekipig.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/0injr5lchi4r2envd4p425b0eu/14686451120.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/30727409693.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/7974469899296e0d4f4ac1e5b7d0f396/62916006462.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/79547775984.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee516e5dae---97962609292.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c9cd07021---kimuwolatavame.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/44c3d8b1742841112e228ad99e37c190/dijofapikinipewaminu.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b602c2bf3d2---15845869566.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/59262321487.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/zokujolubi.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/79322480209.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=lump+in+baby+groin+areaPDF 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_off0000ee92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A4 17200 bytes
SHA-256: aa517339454d742fbc2a7a889e4aa5796d6136d41a5eee0930badeb2a13c9e7b
font_02_sfnt_off00013338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13338 10592 bytes
SHA-256: 9471754b863521b03915a0d8f797eeeffa40730e91816ee207dbe7b3da3cd72c