Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f2129e0011418a…

MALICIOUS

PDF

82.2 KB Created: 2021-09-07 03:43:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b95bf3fbc6e98d077b2ad0b1a7b82888 SHA-1: 76ee7b3f32b2f8ce4af755dba29da9e4cf58d62c SHA-256: b8f2129e0011418a23259a2fe9656076dbea3ba74f915b347809621db9f9c2b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm with numerous URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to obscure the final destination. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, pointing towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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://wineart.online/userfiles/file/sawidubaluku.pdf In PDF document text
    • https://mariellatriolo.it/public/file/37993010719.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/578418f19b79356d422a62304bc79268/13700219531.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782fcdd44d6---88168917146.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/vevekiju.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/dosezilisameve.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce864ead07---rajirawuja.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160f7d6708de73---98721841111.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/wodotokujefo.pdfIn PDF document text
    • http://agro-partner.com/Image/files/26282972591.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/39156573633.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/318b0575d39de790e5b024f41ade29d3/dezasozogijuvakakebaw.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a94392c5f18---jigewiwesoru.pdfIn PDF document text
    • https://togeltop.net/contents//files/40269466763.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/rokedukewor.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/nabutirareriwatuzu.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/06fda4a187379c5d0a1c5c6e4a305f7b/28639103310.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/tezizegowexokekejemima.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/dujesodod.pdfIn PDF document text
    • http://blccy.com/userfiles/files/duropewazuma.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983b8074760---vifugakaxefijubiwo.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/64612974904.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4668b9279---25414444397.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=2018+calendar+pdf+download+with+holidaysPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24E 11324 bytes
SHA-256: 480504acf10e7d9ef39142d2c81fef09ceac55f1e53d35ae17e1a7dbf4c68e8d
font_02_sfnt_off00010d09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D09 18020 bytes
SHA-256: 01396d9998e529074baee025ca7d824d9519133f64fe5bf92f334ef57e7a2eba

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