Malicious PDF — malware analysis report

Static analysis result for SHA-256 a849adf041e4e0c5…

MALICIOUS

PDF

73.7 KB Created: 2021-09-15 10:37:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7b4daf4645dc8318b0a8a572ecbf589f SHA-1: ea94f6d87331000f5af6c5f099ba3edb9b647ec8 SHA-256: a849adf041e4e0c534834a3bf0d90d36679e42556b4cb28740caeab2ffbfb187
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to various PDF files hosted on compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4bfdc3517---73946524221.pdf In PDF document text
    • https://insp.biz/img/file/befumup.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/wokavuledukugixowodaregir.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/60120637180.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/20713837251.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/12406664487.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/33217742744.pdfIn PDF document text
    • http://rnralpha.cz/res/file/buloteniwefigewejid.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/e77fd994cb4155431731240f42c3c96a/wipilefajijupew.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/3274747579.pdfIn PDF document text
    • http://sentralperdana.com/file/dufusogibat.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d51d108c2a---25708497561.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/73386478440.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/40469344659.pdfIn PDF document text
    • http://schokobrunnen.com/idata/kodimemotup.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/xukamewexutozarobaferad.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/rajinux.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/13743396027.pdfIn PDF document text
    • http://jumpstart.mobi/userfiles/file/gafabinagoninel.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/b8e3nulcmjnoddphmso0drthi2/nawuderewasirimexawu.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/8888198489.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=vip+2+full+movie+tamil+hd+1080p+download+isaiminiPDF 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_off0000b915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB915 17400 bytes
SHA-256: 15d5e48cc3451b44d71e507bc5eb5755f977b5cc64518be753369c6e20af79bd
font_01_sfnt_off0000e567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE567 11384 bytes
SHA-256: 3f0a2a81e8698b7b43e41b9e71c110e802a8bb0d0012dafadccdc2b972641ce9
font_02_sfnt_off00010031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10031 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1