Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ae3837873820233…

MALICIOUS

PDF

86.2 KB Created: 2021-07-04 19:19:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 01d62489282dfa2cb42e5c3504ab8d7d SHA-1: aab202063e2b070bcb0a5903be1e0335bcdf669f SHA-256: 9ae38378738202334abbc52503720c6b6cd5a3a70db94b83994318310ef5525d
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous URLs pointing to compromised CMS upload storage and disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/1th686jnldm03hh3uslapuk1pc/kuxudozotimafi.pdf
    • http://at2apigroup3.com/contents//files/18153655306.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ef8e5bf01---rilovesefopokofiv.pdf
    • http://mu-rrrc.com/userfiles/file/guzovapawidobedonirerove.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0f357a06a---84037580866.pdf
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/58e79fb4f56bcea83149b6b6c71858d6/jugezawowevatixigenajuxu.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b605df58048---81836442347.pdf
    • http://cnmrobotics.com/files/files/58704483464.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607d93865e866---44774207971.pdf
    • http://urbanconstructions.org/images/uploadedimages/file/29283741388.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b180042546d---kubovat.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/77893535c3eeb8b10374ed9ca432b18e/74970609310.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1d2af340d---12855039284.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c917c116a24---370206623.pdf
    • https://aronabritcan.com/userfiles/file/depawixojonazagi.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/q800lub3g78n187rpa8ll38a58/53895420287.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd81dc2bf9---98900725890.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c51dde0c207---62422630348.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f54a5f073---durugevunedonijorotaxu.pdf
    • http://sitepride.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/redavukezifoj.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=news+curation+sites
    • 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_off0000ee10.bin
7e1eb2af5fbe4eec5fe3ef6495c71b194728375558d311dacc3fc7d10720f05f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE10 10340 bytes
font_01_sfnt_off0001059f.bin
268e09667e8e6cb7c8f7bfc94c042194f687355429b08a3373e45956fae6c09d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1059F 17512 bytes
font_02_sfnt_off00013299.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13299 16792 bytes