Malicious PDF — malware analysis report

Static analysis result for SHA-256 162bd4362f8bf4db…

MALICIOUS

PDF

70.7 KB Created: 2021-09-04 06:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 363f6e37307929d343bc2f817dd08a29 SHA-1: de298951ca7366e8969c7383a38ff5378c56f1ca SHA-256: 162bd4362f8bf4db8971531ecbeb078da45cf55c7f3ca2715edac6c23abd9a6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories. These links likely serve to redirect users to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9b151f238---poxagevedu.pdf In PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3769204a8b---76932204708.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768c2cbeef9---kupuvakanisaguxowezutimu.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/96762899798.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/9933601169.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087fef4c960b---womuralenasobamabode.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c7b3dab99---41194523783.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/moxamujazek.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/nafisujavifenarejanu.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/81928430418.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/57579040230.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/86503802220.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/fokanitel.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/sidejavoloj.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/pofijawenomabixebam.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/vaguzu.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/69475065132.pdfIn PDF document text
    • http://franklinbristerharveyfamily.com/clients/a/a8/a8910385c57dfddac3c6311e2bd1422e/File/zopovoxijog.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/vl8os5mv2f7amel0dg5j635eet/givixadurajano.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16119b12fc9e33---dokezewumuzupagejopewata.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/luzime.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/2661d7175289cd7cb76865ebd549604b/33382606826.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609bbc38080de---mivodugawunezigukivanago.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/44457998664.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=reading+verb+to+be+simple+present+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_off0000b4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEF 15204 bytes
SHA-256: 89b7d1c9af553aa3d5d137230909d07f8c38a7512f8c9e937104cbd586ba7e2d
font_02_sfnt_off0000f370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF370 11092 bytes
SHA-256: 42b56ff2263f3b1c1fcbad957ac219430d2174b8e5065cf87622666c38705d9a

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