Malicious PDF — malware analysis report

Static analysis result for SHA-256 1523627dadb9f671…

MALICIOUS

PDF

109.0 KB Created: 2021-07-02 15:37:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 792e616130a2a381b2422140798921e4 SHA-1: 3411c60e3d60186df38e95e9ee3b57b9bdbf4ce9 SHA-256: 1523627dadb9f671d541374a074d9549664660f04668793de67a487f91510424
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The document functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories and disposable domains, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farms strongly supports the classification as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://taperagi.com/contents//files/68809879106.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b5310c449---tosowopiw.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160705f32c6ffe---kenujebilonivijasapu.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/eee942dd19f72299f4cb82c5e7783e16/79322360898.pdf
    • http://gyobel.it/public/file/91629986570.pdf
    • http://staresecurity.com/userfiles/file/37072283890.pdf
    • http://dermalab.pl/userfiles/file/94760130254.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba0549554e---dinamenebopenub.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071397232338---bokuzupo.pdf
    • http://micronforgacsolo.hu/UserFiles/file/81120251725.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee4ddbe5df---39420877396.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cfe2d90eb---37781249125.pdf
    • http://ca1970.com/clients/10044/File/tokupeka.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7452c6cce---92248565845.pdf
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/sunikubelo.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4a48e4aabbe317e6cdda066a1033a807/sixonavamer.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ff0926b5d---jipinofizu.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16089aaa46c8ba---zaxusefiju.pdf
    • https://hoangnhataudio.vn/media/files/soridevibowozedo.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083f1d89f135---lujejenaxojamoxexoli.pdf
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/1b98084e13ea3d23cc0f75c55847c5af/53916504331.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/rb394va892kho03pb6k6j9957p/52610641042.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc68ced30a---vaxowagubimefavuza.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/b40b9b99e91202e36f2153a32b8f30c5/36852976869.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=i+think+life+is+meaningless
    • 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_off00014410.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14410 16792 bytes
font_01_sfnt_off00015c27.bin
ef46e1935b3c20c16dd53c691c2660e71119b5520ea6815b7e6a8499e807f454		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15C27 10484 bytes
font_02_sfnt_off000173bd.bin
b92affedd4da2621483c92b8c2e70e6cea13aee0571673ffd944cde93c6eea96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x173BD 19340 bytes

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