Malicious PDF — malware analysis report

Static analysis result for SHA-256 c10a8cc734cd6405…

MALICIOUS

PDF

78.6 KB Created: 2021-06-27 08:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3ec5eea337f6db2b268d69e7d3ab5d33 SHA-1: f4f0d822d8aa06f23d9211a5e27cb944fa210092 SHA-256: c10a8cc734cd640517684200fc92c949e28154c462f2d35cdff058085ff16e59
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://masukpt1.com/contents//files/jinaluluxubiviwezete.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc02b5432e---nefijubozuzosagugig.pdf
    • http://laiyi-art.com/userfiles/file/nurivutarudu.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160754930ba1ad---pinobenebive.pdf
    • http://danielbushreunion.com/clients/41596/File/rotupubazerovanoj.pdf
    • http://a-kamen.com/userfiles/file/7673311855.pdf
    • https://argekaucuk.com/nbg/upload/files/muzotemitudekedaxibozuwo.pdf
    • http://tamlaproject.com/userData/board/file/xogixejisawakubi.pdf
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/supepudugadisulotasogi.pdf
    • http://markasib.ru/ckfinder/userfiles/files/60710036224.pdf
    • https://vandolderskb.com/images/usr/falelalimufazumisulin.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/g8cbeeuqp0vguouift55ve62ea/19352575426.pdf
    • http://nsdadventist.org/FCKData/file/33384382039.pdf
    • http://pogservice.ru/userfiles/file/tuwumojijijelezafasuzibu.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16084b1452549f---64667997593.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a48b5d5f320---95081271387.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/pndbhsomaq92opr0rau41kujb2/nikajogokevenoribivujokuz.pdf
    • https://hpsoft.shop/upload/files/17759629299.pdf
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/6pg98c15107tkm5vcb4e6t3vfi/5465432698.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086cf80c0e7c---lazevuxaturolokox.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aad7ae5aef4---nelezajolasag.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=different+names+for+god
    • 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_off0000d050.bin
5ca3ad9976d5a68be3f82e199537bc1ee0e370ffddb0db02e6204b7af784de15
pdf-font-stream PDF embedded font (sfnt) at offset 0xD050 17356 bytes
font_01_sfnt_off0000fd84.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD84 16792 bytes
font_02_sfnt_off0001159b.bin
ba15b5618c5de4aadb8605dbea0fe99450933cdffb155538f5aab2dbd701b124
pdf-font-stream PDF embedded font (sfnt) at offset 0x1159B 10652 bytes