Malicious PDF — malware analysis report

Static analysis result for SHA-256 af80c33d188dc8b0…

MALICIOUS

PDF

85.3 KB Created: 2021-10-05 18:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d4a42254367a3550134888e768892a4d SHA-1: 6c40be43575d3cc8b406eb61691f1ebcdf600eb1 SHA-256: af80c33d188dc8b0dc4f474e56f62af70d3403d1f32dcfd37dc836ae74fc15d9
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on disposable domains or compromised WordPress installations, suggesting a phishing or malware distribution scheme. The presence of external URI heuristics and link farm indicators further supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://oniceh.ru/uplcv?utm_term=pes+2011+download+play+store PDF link annotation
    • http://hasyo.net/files/file/wuzoliwufajawesol.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/161560e9326dfe---dojabenaxibutemurizodaf.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/49149118048.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/wopegujafunebixibusame.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153a6b124a74---rexovomanonekida.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/resibuvulutuwutewu.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/71471013780.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/xafaki.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/99780154750.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/xinazuzasatefofazusiremu.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/jazasotakoworibas.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5ee0f1df9---56580185147.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/nemanaxosusuzasidagawiwu.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/vapabesixu.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/64245484970.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/nodabanosuzezas.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/ferumifoz.pdfIn PDF document text
    • http://vln.nl/files/file/woxezupazixakifabe.pdfIn PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/josifufesawizigino.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/zabexixabev.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/52418031750.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/siborokenezefubikadepajo.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1615087d979fc1---wokoradodawefomadagu.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_off0000e406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE406 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1D 10788 bytes
SHA-256: 4310241ae0f9b7d2359e00a28e3a2d42474603eb71db80b2d769789498812d12
font_02_sfnt_off00011553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11553 19252 bytes
SHA-256: 37c9e5cdaaefc92c9db6197a77314e8e382707f7773234a177630a39cdabe333

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