Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cf7b8c6c7ee4352…

MALICIOUS

PDF

80.3 KB Created: 2021-09-13 03:54:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 09d7a3f68916bfcaaa6410e7ff58c3f1 SHA-1: 7d103bcde9850de11d9bfbf08be427d61f8a807e SHA-256: 6cf7b8c6c7ee4352b676759aa4cc798837c70a8a448ec4262ad28b054d755a08
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with multiple URLs, some pointing to compromised CMS uploads, suggesting a phishing or malware distribution attempt. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade initial scanning. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://clerus.hu/files/file/piderulomek.pdf In PDF document text
    • http://shesob.com/file/files/bituvekojojetepod.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/b79f880e34f8eb5f274d3ba58f5d7428/livadubutijuf.pdfIn PDF document text
    • http://klgd.spokoino.ru/i/upload/files/kelexi.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/71108512200.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/16612043951.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/80888698785.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/161356171cfdb1---sarazo.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/pamosikusuxarawawutuka.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/8053679926.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/8543177587.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130985f32877---36752080502.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/zazado.pdfIn PDF document text
    • http://erimti.com/userfiles/file/13832960044.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/ranawebowezexub.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/difija.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/kabodilezexap.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/73998898431.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/nopepilevezot.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/tonerojapopedow.pdfIn PDF document text
    • https://actorconseil.com/files/file/27708617889.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/gotazovuletemabarovuwatu.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/bubajeki.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/48697989709.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=wwe+2k20+file+for+ppssppPDF link annotation
    • 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_off0000d4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4ED 18544 bytes
SHA-256: 03f0ec517ef1657c8d1cc46d037d942de18d581f2db4a30beaac5e3fb0a6cad5
font_01_sfnt_off00010429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10429 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C40 10400 bytes
SHA-256: 422746f41d5eec6c9656f022f81a33248fb4f1cfe7de271e3316923c56c28190

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