Malicious PDF — malware analysis report

Static analysis result for SHA-256 e594058eb6419afe…

MALICIOUS

PDF

83.3 KB Created: 2021-08-18 21:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f94f6f0452b904a71f4ca674927bbfe1 SHA-1: 9871e45a47d26893a4497f4e1bdc4ab7d53c259a SHA-256: e594058eb6419afe2c6985b1b0dbcf5448851247b4f74ebaec80ffd6ee4f3e91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous external URLs, many pointing to compromised WordPress sites, and one specific URL that appears to be a lure for downloading software. The presence of these links suggests the document is intended to redirect users to malicious sites for phishing or to download further malware. No scripts were extracted from this sample, but the overall structure and URL patterns are indicative of a malicious phishing or downloader campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=adobe+premiere+pro+cc+2014+update+download+pc
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/md4gr1c8u12qlpk2d443mm1gk4/30951251681.pdf
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/o0ppbvfjcfrvhfkefrmaj12rvf/53265023740.pdf
    • http://fvv-hohenfelde.de/sites/default/files/files/80367739058.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16107bf9259b4e---lipolajo.pdf
    • http://honda-vo.com/upload/file/95517264649.pdf
    • http://ebanksunited.com/clients/7/7d/7da19d52c1086e69e61582739ce98a0f/File/luvazidimibemelorofu.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e27e8af75c---70227835545.pdf
    • http://teakdeck.pl/files/file/zanepexajobojemefepe.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090b2341b0ba---vawosogizabazomipapo.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/052a2d79cb49f01837b554e2f9ac1cef/lexinadodovut.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/0f81c93890c5a40fc85e68877a7e919d/niwisamuwavab.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160928adae82c2---51628967277.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608a905684a05---60439365044.pdf
    • https://betentour.com/sites/default/files/file/revigirivinavamaramiguma.pdf
    • http://polyalpan.hu/_user/file/98368925891.pdf
    • http://austria-ex.com/images/blog//file/kakidizitane.pdf
    • http://turagent007.ru/userfiles/file/xederemomemexurome.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c11d760d592---21856432922.pdf
    • http://gocep.org/data/userfiles/files/katozinek.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/c991cb1c0189879f3bdf240f57b80351/6509185816.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0af6600ac---19836557718.pdf
    • https://die-elke.de/cms/elke_page_files/file/54405838601.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/a35932edbd28379609545fd1f2fc2a6c/juvaluk.pdf
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/domonisu.pdf
    • 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_off0000dd57.bin
d43222e2a5797cf6e0098f3796081d17b042988967ea0f2d61d4c288463e145a
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD57 17524 bytes
font_01_sfnt_off00010b35.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B35 16792 bytes
font_02_sfnt_off0001234c.bin
a15afd44ffac1aa47a7bfd3ac7da95acd2ce9149236ed76c38c7bfe4fe544c9c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1234C 11188 bytes