Malicious PDF — malware analysis report

Static analysis result for SHA-256 28147ab9d87d9c22…

MALICIOUS

PDF

74.3 KB Created: 2021-09-03 17:25:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 94f9666d8b691a15855fe2d3ec2dcf15 SHA-1: 98c9730f4ba89067de77facefbc1f14991c6ab32 SHA-256: 28147ab9d87d9c22bcedca6c35d2fb7e00e2f2ea8e28448f4bdeefe17a2fea6a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://timavoshipsupply.it/userfiles/file/36584013468.pdf In PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608653c937eac---xutebapasobuwunut.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/bogako.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/degajop.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/vrkpqpejrin5rbmq1j5ti3ke45/zorepedafi.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/agcpff9kj6ht7a3736ku31v837/vezawenajesafotugapajiso.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/39222008192.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/4p2b47ea18jfjt465hrusq4v03/nagozaxukezalezaroli.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/rerolurijetopedopigoji.pdfIn PDF document text
    • https://airxps.com/userfiles/files/kuzimuf.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71f86cd35f---mekonevovajeraxudon.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5d90cfdf8---zuxozalimipobawowi.pdfIn PDF document text
    • http://aweibel.com/Photo/file/roreledinatasusufili.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/59181614268.pdfIn PDF document text
    • http://oembag.com/uploads//files/202108120346061649.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/18340690.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a777cb67a19---wejulen.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/16903332667.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/31196437181.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/06/29/1704206524.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/20271123149.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/2656688314.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/rhcld4n1s195kh6omaj6heplb3/72767559856.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/korezefesuwurulalunawojej.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/gadatipileretakejifewafun.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/jekakakenozozikazetirito.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=class+10+chemistry+ncert+book+pdf+downloadPDF 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_off0000bb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD336 11524 bytes
SHA-256: b592b4fbb90936f21c54a9a08f00e8d131b3b70c97576b3a469ae2f040bdf44a
font_02_sfnt_off0000ee34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE34 17408 bytes
SHA-256: 43d3df07f0dc5aaee5797f39e463e95af7772f151b9742d4ec658d72d6f3d02a