Malicious PDF — malware analysis report

Static analysis result for SHA-256 922e66bf2243b288…

MALICIOUS

PDF

86.7 KB Created: 2021-06-28 05:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aaec14b770c74a99ac9d8e4af87b1def SHA-1: 411bdf9be40ef7766062b0f05d644ae85eb3135c SHA-256: 922e66bf2243b288490597308bd03e5d781fcbb31f03e378b194bc06d8ad0f31
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting it's designed to lead users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with a link farm used for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://jrpst.pl/userfiles/file/bojapurukefesewuj.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/7f910db62df78b2875c58c1978012d3f/74552363416.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/cdb5784e43c9e0df5cf64f30c9f44751/75875054757.pdf
    • https://aljazeerahpetroleum.ae/userfiles/files/36586975125.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/be7ee93a24c8dc8aa63aa405de9399b3/70930656862.pdf
    • https://sfeerweter.nl/userfiles/files/getiwuva.pdf
    • http://kusadasidentalclinic.com/img/userfiles/files/31684658251.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/80p6ftnn39tpva4c92bugvfo3a/37699651618.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/74040a875a2bdf1dc44d940ab7ea65d3/duzadixexudedasus.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160706342d5728---7110484259.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/a3ab9b90f42cddbca6955c36f0989233/bumefirodokaregifatu.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a6366c034---bijasejitobabekuzuri.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61c7448fe3---43578859740.pdf
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/070d28298cbf0d4bbea271f8e72c2bce/nadovaxowivadi.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/0837fbca8f3c49e54490aca8bb06a8f3/fodaxepaxab.pdf
    • https://infoenergie-loire.org/userfiles/file/28111052807.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/iumqbmfrdg14ig4tfco4ksosir/fojubujulunopodupa.pdf
    • https://agrilaui.com/userfiles/file/jidijoxewasarasitixosaxan.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/qkqmo7b1586ghk4rshda3a07o5/17200036862.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/m8ic95d6ftm3kcris75jg9rnh4/5680698034.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fc3ebd0c4e5f82942578efae090a0594/50997738342.pdf
    • https://vivekanandbawwa.com/userfiles/file/14523627195.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/26c71b02daa4896a9767ec0f56fc1230/47597404136.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/30938409409.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=the+light+we+lost+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_off0000efd0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD0 16792 bytes
font_01_sfnt_off000107e2.bin
cc19a3435afce692d9e3d5b3c3be7cb059a19c5792d5d3c16f2763e1c3c866a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x107E2 17468 bytes
font_02_sfnt_off000135d7.bin
1b2873eb2df16c047731184c582034236637bae0b252b335297cf9155178ccd7
pdf-font-stream PDF embedded font (sfnt) at offset 0x135D7 10460 bytes