Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa01609888bb9ef0…

MALICIOUS

PDF

79.6 KB Created: 2021-09-19 05:02:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c12c3c16afce17cb25b26c9bda72222e SHA-1: 05c3dd2c39a5015b5095c5f7c8da550fc6dd7d6c SHA-256: fa01609888bb9ef0b64d04c555e83c5344d142ba5ecd6465490fed0a6ac6fd0c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript, though not explicitly detailed in the provided evidence, combined with the link farm, indicates a likely attempt to redirect users to malicious sites. ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=how+to+use+github+project+in+android+studio PDF link annotation
    • https://maggies-handmade.com/UserFiles/files/25900862241.pdfIn PDF document text
    • https://braus.uz/images/shared/file/zisuveda.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/zetotudulipi.pdfIn PDF document text
    • https://hensuyenpqa.traigiongthuha.com/ckfinder/userfiles/files/nimoniboza.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/60062016327.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/3059675276.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/gegimazex.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/motogademirumun.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1613938243f713---37525766866.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/161420e49a9755---kutap.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/16978901244.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/ce60511bb55e491ac667421c5be5cea9/lodezetinetigixugodutodip.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/34678283291.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/vixenuragosakezififi.pdfIn PDF document text
    • https://majubesar.org/contents/files/bibajefor.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/savif.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/10762377446.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/70775576446.pdfIn PDF document text
    • https://urologasdainys.lt/userfiles/file/nidamerabem.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/55754707810.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/54920600741.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/pekivamiwaj.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137974408822---pisunuk.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/fomabelodagatatewuxuta.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/87654842732.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_off0000d306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD306 16864 bytes
SHA-256: 22f1713ca4949414b81d7ec369d788b7a61635e5ba75eac7e77eb7d2e75cef88
font_01_sfnt_off0000ff1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11734 11196 bytes
SHA-256: bdea54813d6991ae152c3e12aebfd7effd56709d047f0f77de69b55e37797444

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