Malicious PDF — malware analysis report

Static analysis result for SHA-256 09281ba450c66bae…

MALICIOUS

PDF

91.6 KB Created: 2021-06-30 06:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b7f441fa3e3fa99712763ba36bb4c5c6 SHA-1: 73e321a39aafd94e12d39c535d02724e2df0ea14 SHA-256: 09281ba450c66bae524fa394a43a6d960865ed43cc49830b2906de8c49dfb275
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting it's designed to lead users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports its role as a link farm for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ac809c9865e---4164564820.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/9a3bfdd5bafe8bc6331688ff04ee10aa/45946366849.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607363f11ebe3---78397026863.pdf
    • http://perlawarmii.pl/userfiles/file/musujarekabivoforozev.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabc95ac29c---suwirasagana.pdf
    • http://www.radanhorse.com/resource/files/15075010472.pdf
    • http://asirakademi.com/resimler/files/texuvofe.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/10610d72f2779f75f38f84e5ea6702aa/dapogefizoberefor.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160902febb4d12---32391953606.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/aa3807b9e0798c7a83d5600675bd8ff1/kofugeda.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/21f082eede0914b5bcd6d23bdae93e24/6227256010.pdf
    • http://suncitygroup.ir/basefile/suncitygroupir/files/41537433349.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f57f91f352---zoxebetivopaso.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/8d09tgq0l3eb20r2rsbma61llu/58564528507.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/71b4ft3v0qmi5qt3ugas4asfpm/36477013308.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761e9f01123---67377657491.pdf
    • http://coytex.net//ckfinder/userfiles/files/mapolupusumez.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837239029fe---36166662763.pdf
    • https://nslogisticservice.com/userfiles/files/50965885048.pdf
    • http://highendschmiede.de/highendfiles/file/zutevudisem.pdf
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/f46e9fa2a0d56f92ef8b7346238f55c8/78589706941.pdf
    • http://mosvag.ru/img/lib/file/gisasarapujiwowimolefi.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfaa577a950---44886199688.pdf
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/18424655448.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=formula+for+period+of+a+trig+function
    • 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_off000102d4.bin
5cbb60413d593c0922a16c8b5f10bb25afe69a5f61a28ea8127ed062b72b7622
pdf-font-stream PDF embedded font (sfnt) at offset 0x102D4 16720 bytes
font_01_sfnt_off00012e59.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E59 16792 bytes
font_02_sfnt_off00014670.bin
be40692c2ea8d735faacb2d70e559cb4fe8ee94d677215063a02fe2983ddd079
pdf-font-stream PDF embedded font (sfnt) at offset 0x14670 10872 bytes