Malicious PDF — malware analysis report

Static analysis result for SHA-256 1de8892890b42f3a…

MALICIOUS

PDF

104.6 KB Created: 2021-06-26 21:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e7760a48d6c59b075e5065c26cc617ae SHA-1: ff2a5d94b9f7dc6efec5452f08d659ee0ea09b0f SHA-256: 1de8892890b42f3a2964b076b9f57ecb1b8382f20950690a83e54c79957d6e7d
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to multiple PDF files hosted on compromised CMS uploads and disposable domains. The document body is heavily obfuscated, preventing a clear understanding of its direct intent, but the presence of numerous external links strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 6

  • 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.
  • 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://noddy.nu/images/file/45518890821.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16075efbdb6152---73450347050.pdf
    • http://thementalhealthadvocates.org/files/userfiles/file/nemevowusozuf.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/009ca47d613acd2a788b899c70ee4095/nutokomoxurigeroxax.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089d5444f87d---25550571305.pdf
    • https://churchofgodinjamaica.org/app/webroot/files/xemuminubitujaraj.pdf
    • http://annandale1963.com/clients/69704/File/25895274860.pdf
    • http://banglenhospital.com/UserFiles/File/40422239571.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081149bc9c5f---birisowupenitu.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9d408ff7c---33515637737.pdf
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/rifodaxedugaxod.pdf
    • http://automsystem.com/UploadFile/file/20210503134429735.pdf
    • http://atek-ent.com/upload/file/fuduvufabevek.pdf
    • https://hoalavender.net/upload/files/33562825006.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607584e6230df---55281050138.pdf
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795d65ab7c3---34959538204.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/8f582b48f87df4c3ee193dc1dccd7564/vupegevifebokomonilijiji.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8e7a70a00---55525565165.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/78053b051d01c864568afc69a966cdd9/65295212267.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a7953ab6ac7---50179551545.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/68bacdebd70afca5c199f05ac6a6ec5d/jugunu.pdf
    • https://atlastoursntravels.com/userfiles/file/darejizevivured.pdf
    • http://olgapolyakova.com/files/files/97876424627.pdf
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/05d51f9c323bef37e37c9484104ee916/gevojuvumusodoveleji.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/8bf5c24058e5eef9a4da6a145d25d5bf/65845584995.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=fourier+series+lecture
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000135d8.bin
98626ab2f6abe75f986c40e59682cfc6b97f990c4d3e0e0e427613350390c537		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135D8 18464 bytes
font_01_sfnt_off000166d0.bin
7ca5a7af645fe22003bcca99485d45dd8fb5965108c8fcbabaef0b7cedb1311e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x166D0 10036 bytes
font_02_sfnt_off00017d45.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17D45 16792 bytes

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