Malicious PDF — malware analysis report

Static analysis result for SHA-256 429195b7bca9f8b9…

MALICIOUS

PDF

77.2 KB Created: 2021-09-05 11:08:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c6243e2b1a0fc74dacda1a78339396cb SHA-1: cf4de693c28729e9e4ef7d6d9f2b219e6aa4d46f SHA-256: 429195b7bca9f8b960fe6bcb3a1981636bed768f6f6efe9f6d9a9a5406313afd
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, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 http://cw-cut.com/uploads/file/butosigaxixazar.pdf In PDF document text
    • http://flirdining.com/uploads/files/51483753810.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/27981621092.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c382e6b6ab---vutufozemojezejosutifufol.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/83164786537.pdfIn PDF document text
    • https://combrooncom.com/contents//files/vogijo.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/3qefs01cg9354csum6lr9goiip/sexusatavimilupabonidoko.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/11d29bce8a1e139dc2c6539b488b70bc/pifufu.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/60938258642.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/738fdb13479bc5d7feaccf9696520606/79841822889.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/samise.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bced6b9fe---gefilekakikilimesabe.pdfIn PDF document text
    • http://sun-tes.ru/files/file/pafurebade.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/15214945933.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/doxabawawagofovabenu.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/sibenijitanul.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/33804780211.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/golowugi.pdfIn PDF document text
    • http://accountingworld.in/singhania/downloads/file/zosavedosowirugolib.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/b642a61b4d65dbb3f945f790e3d56eda/jenafijomilow.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b66846a9f8b---45392302596.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/nitakezasawomajaxob.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/c7cbcf17e9094058cb524ccfce0d452a/wunomezurolonabogotu.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/dubifigetujuraxumefole.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713324de53c---wudejutawivopamej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=governor+generals+of+pakistan+pdfPDF 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_off0000c553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC553 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD65 18732 bytes
SHA-256: a2ed208f8127313e6bcb98fc3627c1a6cdc77259d178fadc03a9346566df8040
font_02_sfnt_off00010e0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0C 10872 bytes
SHA-256: ecd9f78c855a1c9f1a35e693409ade80f2df56120650ee4ed8879b67dd7c8fff