Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd332b385b126cc3…

MALICIOUS

PDF

147.9 KB Created: 2021-08-19 23:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6d11952b98a2b1ecf5fa6c154ce8d6f1 SHA-1: 337af06476d6cd7bdf1c8524a2b96b6cd566fbce SHA-256: bd332b385b126cc31771a3b572f924c337924725374e78faa35c0f25199ecb51
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9782

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ibdlffqrscrpva6uor6nqqqlui/xatubefodarefafefomuzuba.pdf In PDF document text
    • http://sjar-tech.com/uploadfile/file///2021071518291875.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/zekasojopabiwo.pdfIn PDF document text
    • https://mcrlclient.com/ckfinder/userfiles/files/36166461064.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/2bbf5877ede6dec9b7a180e8ad6ba198/16876538750.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210613165738_hpflah.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/zepaxagivariretaja.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866deb226ea---82042944924.pdfIn PDF document text
    • http://georgeandmaryjones.com/clients/f/ff/ff66b05efb8f16ea353d8e6908bb1429/File/6937205567.pdfIn PDF document text
    • http://hintzfamilyreunion.com/clients/1/12/12a2788c5de59b93c87e4eff35998d4f/File/87399353431.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/daler.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102eb4155aca---dejorabug.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/8174abd63b2ea4cfc6b9ca0d54a15507/96698326038.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b9fb2a9a3---rewiwimijen.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/43526973539.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/20f33fd3ca01b3fe82167de0e33a1068/27133790897.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c900a1fd26---17048244591.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/98316130785.pdfIn PDF document text
    • http://slp61.com/clients/e/e2/e296dcecfd7d10ffef0cc83fef253c72/File/79604312995.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/pibovozidume.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/30124658711.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/a178c6c66f89fd9f507fe55f95417928/kulaxovunek.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/75689652703.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cc73d27a5ed---xigojifaluzanexipakivodom.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608c781386e36---nipenedigemuximinogesoj.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/fopisem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=survivor+season+39+winner+votesPDF 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_off0001e070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E070 10724 bytes
SHA-256: d2d1c5aeb9e15fe35e1ac1f7eb01dc9fdb93affaa978717cd7b3730265f35670
font_01_sfnt_off0001f94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F94D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002115f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2115F 18016 bytes
SHA-256: 671e03d2b01489b748aa083c72e7f01035e66048d713dec7444d9136e9809e5e