Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc789a010b96000a…

MALICIOUS

PDF

68.9 KB Created: 2021-09-25 19:36:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8227f7e69df0542c2c7119fb3a87f5a2 SHA-1: 80ac021a2b43d10b2cea11fe15d8aab62fd96bc1 SHA-256: fc789a010b96000aba5ff45ef236351feca193feb5cfb9c47c60791d2be6f32c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://nomylo.ru/uplcv?utm_term=holy+bible+sinhala+pdf PDF link annotation
    • https://intersensor.ro/v2011/Files/fck_upload/file/93390032146.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f9bfca9c1---91317917307.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/73280166670.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/7460029481.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210913_79AED762118D5C43.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/jideboturagisigawumu.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/pigufatujaxon.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210919102616_ip7fsb.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/76533775967.pdfIn PDF document text
    • http://dakov.hu/_user/file/zinawom.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/53948565328.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614bbbe664786---2776023233.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/225j5m91iehqadaue8deps7975/62901032050.pdfIn PDF document text
    • http://whdhgs.com/uploads/file/20210910204458993.pdfIn PDF document text
    • https://panama4d.com/contents/files/razokisat.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130c82fbacbc---23673591164.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210916_5455F734BA27300F.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/49584866181.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/giruzeronogoludivupum.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/zebopogijutubub.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/70349848701.pdfIn PDF document text
    • https://opescom-store.com/uploads/FCK_files/file/buzedotijuneb.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/fepuze.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_off0000b100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB100 14688 bytes
SHA-256: 9e2f773e87b01d6747b20318834cb0cd097f98901ca7d22f9cc284d3ab2b753c
font_01_sfnt_off0000d5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E8 10644 bytes
SHA-256: 3cb846dfae20479738b05ce2d70dfbd57c412b491854b43a5eb7260de2852db9
font_02_sfnt_off0000ede7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1