Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0545c469f9f322a…

MALICIOUS

PDF

72.3 KB Created: 2021-09-26 07:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 747a229d577aa74d21bca407acaedb34 SHA-1: 8c4200258463f2eaad6b8a5ddf3e369015f2b9ed SHA-256: a0545c469f9f322aa795f654945ae7527bed5755ee288449232c583e8808784e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm pointing to potentially malicious content, including compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure, likely leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://irlanc.ru/uplcv?utm_term=free+download+2nd+line PDF link annotation
    • http://jiji.pgo.tw/pic/uploads/files/liwitatajokewamo.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45849138119.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/jiwelakaxexelawafe.pdfIn PDF document text
    • http://vendax.ro/files/file/76938676658.pdfIn PDF document text
    • http://stagticket.com/fck_upload/file/kejizax.pdfIn PDF document text
    • http://mobil-tech.com/files/91823634113.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/78766153775.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/maselamadiligebaveg.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/vadabu.pdfIn PDF document text
    • http://heimundsicherheit.de/userfiles/file/89058588203.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16136bdeaab5d3---wevalasemijidevagopipidok.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/44088349028.pdfIn PDF document text
    • http://kasargod.net/uploads/file/38363077101.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/lekajowabokaxesoniroxi.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/xojezegimoropajenojaso.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/82672889864.pdfIn PDF document text
    • http://1000projects.ru/upload_picture/file/dimetumej.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/74945615311.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/soxewomixiluta.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/sejuwagajud.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/63708271936.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/bi7uabp0htbgme21kb8b2urh0g/44303641286.pdfIn PDF document text
    • http://sfalojistik.com/userfiles/file/ruzalexogezugiluf.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cdffbb2f3f---84031530465.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/rabuvijor.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/futalowetarokezupate.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_off0000b561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB561 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD73 18272 bytes
SHA-256: 5ffd0bc3a191424be5933f0eafea89f2de79c4f87a09d9b10bf3f8e0c912c1a2
font_02_sfnt_off0000fcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDE 10156 bytes
SHA-256: a40d3b66f0762a4198574e01e394941850ff699b96d48c9c4141133ac7c76da0

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