Malicious PDF — malware analysis report

Static analysis result for SHA-256 82d7d6d6f0475e99…

MALICIOUS

PDF

86.5 KB Created: 2021-06-26 20:30:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bcab07cdfb8627dba0296abfd180855c SHA-1: 947a66edea6be80e1f291f7e4cb4a47e0d432947 SHA-256: 82d7d6d6f0475e991ee0185b3c6c7b671579e8a849c97f424d86d4cc33668a1c
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating it's designed to redirect users to potentially malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the overall structure points to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://lamthong-marchph.com/piceditor/file/22895729931.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16075c51bc920b---vigogazasotinizo.pdf
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bd4610a9f---nodagipedijateresezowen.pdf
    • http://4998horo.gmmwireless.com/contents/files/sexiwebesakotadivowomo.pdf
    • http://leakefamilyreunion.com/clients/63964/File/14617964534.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/veeik2kf3bru62bjgkh43firp0/xasevowizuvuwomo.pdf
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/2d7b241b81f5990f15421186fd24a988/lumomu.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/gcou7eoqvt7p8u06eei0597kvi/27651116197.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3b25818ea---ripetejafowiwegezulopomu.pdf
    • http://aptatravel.com/clients/4/48/489dad2d2d8436d4c085fc0ccdc2d1b3/File/pezupifilusuxemijarajom.pdf
    • http://cayxaotamphan.net/userfiles/image/file/pekodivorekilidewuge.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/603f717e767fe7cbc2a1ea983358317c/nuzujijojigutonivunud.pdf
    • https://bikeid.net/ckfinder/userfiles/files/lajerapuzugefodu.pdf
    • http://cementfeet.com/userfiles/file/87995508846.pdf
    • http://allamericannursing.com/userfiles/file/99134539665.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/v5n91ep04tdo2ebtcdr6qfi5p6/18905061680.pdf
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/gm7grbkmciiv38r9ejih53c97p/95257945194.pdf
    • http://farmaciafoglia.eu/userfiles/files/96573067183.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078890d1e5e1---91328859485.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe09da7147---45907030522.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8b136d3cd---jivolivasap.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=monohybrid+and+dihybrid+cross+problems+with+answers
    • 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_off0000ec95.bin
a238b17cd16c59ca50e55a9e6afea9f7e8250ca618420305048163eae4300770
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC95 17640 bytes
font_01_sfnt_off00011b06.bin
1da414430b7f208fde324164ddde15b46dbcff2845d63d3d79e61c872b07e7da
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B06 11112 bytes
font_02_sfnt_off0001349a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1349A 16792 bytes