Malicious PDF — malware analysis report

Static analysis result for SHA-256 76a9d354bfed89eb…

MALICIOUS

PDF

82.6 KB Created: 2021-09-09 14:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8b55e3468d470f039beb8cceb11aa5f3 SHA-1: e99b3c467a6bfde03f9864bff94d96b659c219c2 SHA-256: 76a9d354bfed89eba84471edadf5d662b0aebd49a136a9b39616d086349813c3
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external URLs, which are designed to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://synerhu.ru/uplcv?utm_term=square+watch+face+wallpaper PDF link annotation
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16134614cb2573---4325649051.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16135037c63626---92704970002.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/70263054473.pdfIn PDF document text
    • http://przystaneknida.pl/data/aktualnosci_imgs/file/46805921942.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/batuxewisimadi.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/52294780477.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/bawifegi.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109070428017775.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109030033584103.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210904153800791801.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/ramanun.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/78543015756.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/41827704699.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/73843744283.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/puwidegojax.pdfIn PDF document text
    • http://klenderbio.com/upload/files/jixefasiwuvememedejab.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/pixezezomukuw.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133c6267a70d---88685443888.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-07-05-50-55-60.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/92296632532.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/dofopusesozikokelumob.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/61338103607.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/pujebewenarexefugamidune.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_off0000ddbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBC 18240 bytes
SHA-256: 11193584802d9c1b7113e8781e51cf70dd53deef1c1946b55454a6188c0b7498
font_01_sfnt_off00010cb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB6 10500 bytes
SHA-256: 030c9c90c9ec25e1b109717bf4fa0a207f8a204c671c8b0eb2e82291adf2e30e
font_02_sfnt_off000124d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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