Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6a8ec6e533302f0…

MALICIOUS

PDF

81.3 KB Created: 2021-09-20 17:54:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6b47af4c2cffadb30ab0a271765deb94 SHA-1: f57c80db3a644d4047e4612c4673574158281509 SHA-256: b6a8ec6e533302f02d05e4d823909b182ccecbe6679ce15c466fbeaf1c9b33f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://drafthe.ru/uplcv?utm_term=monopoly+offline+apk PDF link annotation
    • http://caerulumpharma.com/upload/files/16130166821.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/42196843828.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/wewudu.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/saxavezusezofazezemoletax.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/48541767268.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/tonukidisorigexid.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8ac5a4bce---8599872597.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/fenizazizesoraroneban.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210918012929.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8ce049522---35596800738.pdfIn PDF document text
    • https://forumsevens.com/images/file/62446853991.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109190647526606.pdfIn PDF document text
    • https://dm288.rs/slicice/file/kexilo.pdfIn PDF document text
    • http://www.rsvpcatering-ar.com/files/imagesfile/88351734511.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613b662f22f4c---vejotorolisaminibutejidiw.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/xagimojulejopukiwugawa.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa7458fc36---39250354890.pdfIn PDF document text
    • https://mrpressconsulting.com/UserFiles/file/mapawiwanidanoruwubepi.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/tedumolufobava.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/dozutizolof.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/mudejulijomisad.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sosuxifuwomizawosawe.pdfIn PDF document text
    • http://fruitsad.pl/images/file/68100915283.pdfIn PDF document text
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/tesepoxutiwabonaxoz.pdfIn PDF document text
    • http://vector-food.com/userfiles/file/24736683666.pdfIn PDF document text
    • 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_off0000d9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D0 10184 bytes
SHA-256: 367179bcbc5093ca88ac6b21ac95f80f8502b63429407486cd5731721dab49c2
font_02_sfnt_off000108b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B7 17656 bytes
SHA-256: 50db7b3695c3eadba16f43b5b10b91713338a4af509400f8235d6b35db217c0a

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