Malicious PDF — malware analysis report

Static analysis result for SHA-256 8830bc0f4e9f2cbb…

MALICIOUS

PDF

71.0 KB Created: 2021-09-27 12:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 48179620d27236aaa1ac4c16219927ab SHA-1: 0d62f9f6cb4b9ce1bae13db128334b2d5a9600ce SHA-256: 8830bc0f4e9f2cbb740aaddf96b0eab8a04c6bc384e1405c805a57f7089f277d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload delivery. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://globalybm.com/ckfinder/userfiles/files/1632310713.pdf In PDF document text
    • http://jandenzobv.com/image_uploads/file/73960365290.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/setovam.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/goxuvugofagubekimeworow.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/91902955583.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/5704127151.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/12814e3387e68a585b68655ce6f8afde/44712627097.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/latazi.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/87284312318.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/36007156967.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/zonole.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/f8c69aaaa97239a7c875aeb1c577cf49/naperinu.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/54263216364.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/94398262698.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/62hp86e7ataqmveokkapanp37j/zawabini.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161434ccbaf4ba---sabelusifizi.pdfIn PDF document text
    • https://medtek.vn/storage/file/vexixudujofisibasijorex.pdfIn PDF document text
    • http://erex.hu/upload/file/posidejutipira.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f6253056a7---xujilokupuloda.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/woreropubokidemisenujuga.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/mowuxoz.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/rofodalujoganujesezi.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/53674774315.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/gidupag.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/83cd14520b64c4afd940bdff9e9d26cc/dolukedovif.pdfIn PDF document text
    • http://saveursetsavoirs.fr/image/file/77356543368.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/zutonepobef.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/40394776517.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=whatsapp+auf+anderes+handy+%C3%BCbertragen+iphonePDF 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_off0000b448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB448 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5A 14944 bytes
SHA-256: d581117f30e5042dc04f6e06126df5e50f078d700a0f3334f769fa976b915beb
font_02_sfnt_off0000f190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF190 11272 bytes
SHA-256: 8febaa8b23f38b8208bdb99e2c131be1a619edce9c8201f82abf1d31d04aa398