Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cba26717bd4c8f6…

MALICIOUS

PDF

84.6 KB Created: 2021-09-01 03:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 552f17d2641cb5c97ba9acfeaf9f9205 SHA-1: 2fe466fd451ab65d4b09dfb0ad042e5f6fc06224 SHA-256: 0cba26717bd4c8f679fcf691969d26c4062cb63187852773e69a81e455ef31ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple domains, some of which are hosted on compromised CMS uploads or disposable hosting. The embedded URLs suggest an attempt to lure users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9527

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/cf8fe14d780d181081fcc464b7943aa6/35426028253.pdf In PDF document text
    • http://riverside-plaza.com/upload/userfile/files/15314633002.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/60739946535.pdfIn PDF document text
    • http://spprp.pl/userfiles/file/gabuwusoroli.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/davog.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a035f52800a---59604521974.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/3891314589.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800ccdf39ae---kixotido.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/vipafax.pdfIn PDF document text
    • http://hmsendo.pl/uploads/editor/file/gipegomamojag.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/f6e20474814dc36a9bf7625617e9a5ab/sunudiguxufino.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/94792151475.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/48524482022.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/diburuzazobiji.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/48551519741.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b211a3613c3---bozobudexufosibotopuxarik.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608874b15316b---nukoko.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/798376804f21490985c2bb76ecba6563/pitobutifipasuwuvajawun.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/41c12a0457419808ba9556632290cad9/9395147214.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/24c05d20df34592b5b1a7db2cc71f658/xowewitaterujixajitepodu.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-8-20/20210820140342200508.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f6f047c0bd0---zixuxa.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d39895eef35---fazadulinu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=donating+to+charity+tax+benefitsPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEED 17944 bytes
SHA-256: e375c4b408af8f863978455df8f12a525f17f1bfd820f5d7a7dc7716a1f60dea
font_01_sfnt_off00011d31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D31 10928 bytes
SHA-256: 036cdcef0edef31b8b78d4c13bbe7c24ad1b6457a9660f75003efdb4f8bc953e
font_02_sfnt_off0001368c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1368C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1