Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2d27da162d0dd12…

MALICIOUS

PDF

88.0 KB Created: 2021-07-07 05:41:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0e9c33e26de4b23e03042fa06f532536 SHA-1: f4414904e3a2d93585b7bc3316b383aacc69ca41 SHA-256: b2d27da162d0dd1259ba5eaf8f5780ab20b875a1d9df16d59ab361b18369ac39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves directing users to these compromised sites, which are likely used for phishing or to serve further malicious content.

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://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c50ed89ec56---lugijevanenolonuxu.pdf In PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160853e0f6b191---kajasoxugofanozefusuvete.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/58218691698.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/reladaduzasewekikiv.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bc18749b7---78309562741.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608b96813a7f3---renivodomujigag.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/75laspm2u5pc0b134srilfs5v3/83134792817.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/af17ac1701770d7560e228664f94752e/97917802235.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/luxubujabobofesuxavanawig.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/61923576648.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/bf4f83dc6dc18f5b35ed90e65a45db19/kevewizorojujin.pdfIn PDF document text
    • http://deborahbrown.us/clients/860103/File/21289360046.pdfIn PDF document text
    • http://guowangcable.com/d/files/72258780299.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/turovelu.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/87695992609.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/dadb9cf157cbddda67a01412c9085b75/18094547024.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/d3bba0606a4996ad727a12ca82e55aaa/sejiwodumadaxiwiwovegojag.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c60e722bb43---43493103890.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d581a64ef9---xotozusoje.pdfIn PDF document text
    • https://artbynela.com/uploads/file/60997358975.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/mojawevugamojix.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/gofixopojixolenikufuru.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/79b099fbb53e15aefe44aef96a989f3a/lolelanupewu.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/mufudaduso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=what+is+humidity+and+how+does+it+affect+the+weatherPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000f300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF300 10988 bytes
SHA-256: 397a48e61cdeee10ae8cc0291ee7a2883358c78fa56abd8e5c24937392f8bf4d
font_01_sfnt_off00010c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6C 16812 bytes
SHA-256: 459f31db401c9f51cf8c039de7c80e1212b5b4efbe6ec2088b1458e92216c656
font_02_sfnt_off00013842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13842 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1