Malicious PDF — malware analysis report

Static analysis result for SHA-256 920896ab21a31270…

MALICIOUS

PDF

148.5 KB Created: 2021-09-05 23:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 14abd7b7b60f78c893f9446c5f64b446 SHA-1: dee2fd6e8241d675f5a9341ed7e29e4dc31082fd SHA-256: 920896ab21a3127071f6dcf48925818759f42991ee20cd533be298fdb1021460
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to external resources, many of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the nature of the links suggest an attempt to redirect the user to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5135

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/f8175ffe5feebcf8507076e46e5b96bc/xumolanubimonubemijaka.pdf In PDF document text
    • http://palazzodiaz.com/userfiles/files/65654449454.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/4f5caaeb7011127d2bc25f1d9c2b07a8/mamusigasom.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/26191994172.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/50879141506.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f69694f9d4---62684684441.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16080972826b08---feguxomix.pdfIn PDF document text
    • https://marosme.ro/hirek/file/ratudu.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/33761726140.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/9uh099r718ugcen2e22fq7qhkh/64501174153.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d996f7f1c2---82410553878.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210813_1FA50AF002CC0B49.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/sitolipifumewuziri.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/73842732262.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d4a486475---32411557508.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/xenedilak.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/94q0bceiv3ct98gql8mpgngjfu/kepuxofuvobaxil.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/fufigasewenegimififososa.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/10a062d9e874805e3432d95e32ab77aa/lefabiwamoz.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/43d1ea538f1c6f34975df5d46cacd233/bopuvinilupe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077895dc7e21---70387816134.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16074900381ad5---kazudewegetugiwotagogugi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=tantra+tamil+books+free+download+pdfPDF link annotation
    • 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_off0001e7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E7E4 10940 bytes
SHA-256: 9737de214125578dad0c460d8d3403cc29ae4b3c9a36db5006726e9649b78911
font_01_sfnt_off00020119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20119 23436 bytes
SHA-256: 5d7092978012a01e3675a4c83882298062684ae31f8b303c2031314e161f10ae
font_02_sfnt_off00023cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23CF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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