Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f087243cf4a6313…

MALICIOUS

PDF

84.0 KB Created: 2021-09-03 22:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cec2941ab4c7fd779a9a20e08d3dfe08 SHA-1: 20932a4cc25b25a88d8229fffb530a5171f5b593 SHA-256: 3f087243cf4a631364dcac637500aafa538f10ce4cee52b4f79220f451bbdf4e
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded JavaScript stream and numerous external URIs, many hosted on compromised CMS upload directories, suggest the document is designed to redirect users to malicious sites. The primary lure appears to be related to 'manuscript paper printable pdf', likely a phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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=manuscript+paper+printable+pdf PDF link annotation
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfd637b151---lukepetorirutolidewegumi.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/48284076334.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/560342353.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b99151a1e85---12644017277.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/79992316712.pdfIn PDF document text
    • http://palami.by/images/file/81329314811.pdfIn PDF document text
    • http://hueide.com/upload/files/54555319845.pdfIn PDF document text
    • https://camerabentrenet.camerabentre.vn/ckfinder/userfiles/files/12202721566.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/96121932866.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/2488836172.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f021651e9a8---39260934324.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/xibeberasobopa.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861b9a99e10---xitarovapifew.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f1b3da1b1---98085351067.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/39626447790.pdfIn PDF document text
    • http://beergolfers.com./blog/images/file/92116123523.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/43512904289.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b34eae162a9---levojodizomiranifiraguse.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/223794aa5904c485430ac6d60efea7b4/nemavuriw.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807d02b1fba---31166721687.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/monivopetopexiwifazabime.pdfIn PDF document text
    • http://annabarons.lv/files/files/jumuxakafiv.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d29a8d2951a---tavosofemuxeriruvegap.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/jegex.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/zapixoselobu.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/0667e81581e2ee6c73023008c9cc049d/jumaletu.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_off0000e50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50B 17140 bytes
SHA-256: b212f33c886eab5528286f59c4dab490b29ac7224491690f01686b6f4feb4644
font_01_sfnt_off00011187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11187 10724 bytes
SHA-256: e65c58d57c3f2c435afd6f13b60f18d805543c213ad8e386b456c88c8a74ef07
font_02_sfnt_off00012a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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