Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bcb3edf56c75fdb…

MALICIOUS

PDF

80.2 KB Created: 2021-09-15 13:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 135d312f1fcd249ec4373c379c20d80d SHA-1: c04c78c337de31e1e429b71d8f9f787b4227791d SHA-256: 6bcb3edf56c75fdbbb3cd5bf8942de7fceab5f4a3d62023a977aad665301aaf0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of external URI and link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://allytemp.ru/uplcv?utm_term=no+script+firefox+android PDF link annotation
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec4a25b93b---lasuzisefulavewof.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/84217521698.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/22588857257.pdfIn PDF document text
    • http://snft.ro/media/file/venafajuji.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613746c4b7fa3---11738735411.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/janeviket.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/4380405586.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/siguwegejajoxir.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/82318067876.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/vijabag.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2f3ebcbaf---25362733277.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/73528084018.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/paxarixoratijum.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/resezanigasilogun.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090609071473499.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/14333205225.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/lumadizow.pdfIn PDF document text
    • https://halkapsikoloji.com/userfiles/file/2578763569.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/teduninubezebegewemu.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/45678873071.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0915/58ac9f2c7fd45b2764cc23a09738ab47.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/27783645699.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/121745133.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/93153663641.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_off0000d554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD554 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6B 10648 bytes
SHA-256: 2198b9c65e2d091c555dbd7aec38c5c1f70bd108b6b7675d920a93d39cf19b19
font_02_sfnt_off000105f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F6 17952 bytes
SHA-256: 6370b64e765bdb96814c444a0cf95263f0eaa633713a400c39cc20ba287a4cda