Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7d2205742fb494a…

MALICIOUS

PDF

100.6 KB Created: 2021-08-01 05:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1761069d2a1307459a28fc42d8348c7e SHA-1: 17d642fad4f774fc97170733009f5b22b9bcbac7 SHA-256: a7d2205742fb494a4fd2f2e597d127515bd8ecd9c66e89699d4132e92de25f05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to compromised WordPress upload storage, suggesting it's part of a link farm designed to distribute malware. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely masquerading as a download link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 6

  • 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.
  • 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://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857a3881e2a---lanifibukejakaxovajimu.pdf In PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/4279f40377fb76c4a5795af94ee1b685/59201343125.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/r3uq7lnqlu1dilvsu2ja7eu2je/tevewuxiforir.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/9951c97eeae35dbe0fd7df4f7e54a13a/rurodapusuburit.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/97443817990.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/40916283404.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/zinadowifutosinamabawomab.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/ddc00101f0e65b22b215e65963c83547/gokupovamobiwi.pdfIn PDF document text
    • http://tonystelly.com/clients/873487/File/1992122706.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c18012c12e3---fafavijomineso.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/b476b982ce17a860e05373448a463f64/59044498997.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/fisipata.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/e4cac4faded797e29036645e16816d46/fomexarexejemepimin.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/077c977ab64c61b8ca958f03cf0f69b9/xixube.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/satalagejil.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/21667646676.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/38275460946.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/rifotofelidus.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/11399892774.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2d26a2f6c---89062460726.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160db6ab2d4d84---joxadomigu.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/9232c33136356067fd10880a5036b375/senukagejowe.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdbb40e06a---94301262061.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=counter+strike+source+non+steam+download+czPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA0 10900 bytes
SHA-256: 295d1dea988c5acbc79be53a04641efbb3e61799f31543c2e0abf384e6deec63
font_01_sfnt_off000127fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FD 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_02_sfnt_off00013d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D6F 17776 bytes
SHA-256: 1e4a2bba041337b6d10d59b069e7f85aa4f6c152764571cb781de0ac882d01c0
font_03_sfnt_off00016c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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