Malicious PDF — malware analysis report

Static analysis result for SHA-256 a63452cbc858a779…

MALICIOUS

PDF

72.9 KB Created: 2021-09-27 13:34:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 5fb97b764f7b1d4c3c4c2ca8b7246c50 SHA-1: 276c2d365af164bb482ab2d40397cf385f6ddc33 SHA-256: a63452cbc858a779a7e212445e9c73f065b89f20d850f49d17c6c010250a4e58
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to manipulate search engine results or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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://medvor.ru/uplcv?utm_term=how+to+write+name+on+lock+screen+in+android PDF link annotation
    • https://soudurelauziere.ca/upload/editor/file/xujos.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/3243816389.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/pajejo.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/79002486354.pdfIn PDF document text
    • https://luminex.pl/upload/file/62998076590.pdfIn PDF document text
    • http://villkasz.hu/editor_up/9495912758.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/88232670995.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/xesoxoruxadupuxiremeke.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c3aea68a8---46198203822.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/36263642755.pdfIn PDF document text
    • http://caythuocnam.org/images/files/wonimiperedizomajikofok.pdfIn PDF document text
    • https://badrivishal.com/media/49798140237.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/turokodovarur.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/72cd8faa2bbdb2b1647d0b5ef7703375/23225795509.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/bokekefakonomilevobidab.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/16bb4a7f23062d114602e19c4e25b8ad/boforuxesuxurupinana.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/sesazavizusomibogi.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/gilasupijarefosuzalaniv.pdfIn PDF document text
    • https://tl-systems.hu/files/files/dizetirotakus.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614148d27a736---1934083349.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/wefiledawerebogusatidatiw.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/tupajamefavonezixatozuka.pdfIn PDF document text
    • http://uchid.com/uploads/file/26656003590.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/rigolamizuz.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_off0000b78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB78E 10700 bytes
SHA-256: 67e37e48359c024ee07df3a7c474840e79953cd4b001b7870793ededf375e7d1
font_01_sfnt_off0000d01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82D 17788 bytes
SHA-256: bdde341d341df89e3fef58336ffec073dd2c93ebcbf85d399ecf64a540a661db

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