Malicious PDF — malware analysis report

Static analysis result for SHA-256 9016732db2e5aa88…

MALICIOUS

PDF

75.8 KB Created: 2021-08-31 11:36:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c26d588fe9c889f87ca7c7f5299fea1d SHA-1: c1a9f7ea1580e5e1de408196e53202d806589568 SHA-256: 9016732db2e5aa885e6081ddd10d2cf000068b5785fe0e0b21e43ef9a4ba678d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • 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://gkia.org/kingkong/userfiles/files/63557284800.pdf
    • http://campcolefamilyreunion.com/clients/82065/File/97681886249.pdf
    • http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/89990866507.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609468c84a833---13311449796.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/v3epm3o7ji9ltrsko0pfk5tgn7/tafanarupulepab.pdf
    • https://torgradio.ru/new/files/file/95214598835.pdf
    • http://masseydogs.com/clients/f/fc/fc2e217ffa4851e49ca3cd921a15cf41/File/zevelemorananu.pdf
    • http://aarogyamedico.com/userfiles/file/ledubuk.pdf
    • http://anapro.com/ckfinder/userfiles/files/84936859687.pdf
    • https://renebeumer.nl/userfiles/file/56267504975.pdf
    • http://indianspringhomes.net/userfiles/files/pisegomoxovar.pdf
    • https://aartipalette.com/userfiles/file/75509763728.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9804ccdcbf---71811459050.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ddfed10afec---67670386155.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/b71d792e51262e0cc8169f8066108b94/24714490529.pdf
    • https://yepsell.com/userfiles/files/57271336394.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/9c6f0a07d7af884f68ac6d18aade6f7f/risojudovarug.pdf
    • https://dichvuketoanvn.org/uploads/files/safinuvegutagitilunibu.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160d4bba3a8fc1---37212453776.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e0b5cc1ed72---xekumujifovetakized.pdf
    • http://baocaosudanang24h.com/uploads/image/files/lekasefafafazaralujofuda.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c9cea0c6c55---gekaboveruluvofagapebof.pdf
    • http://classtool.info/upload/files/tibekilupakilanew.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/7b210ed3a0f8861199a7fb9db3d44b67/60534346056.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=chf+differential+diagnosis
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4ba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC4BA 16792 bytes
font_01_sfnt_off0000dcd1.bin
6643eba11cfd966ffb2d83fa8020fd678ca406bc5c2e307548353208095d8a19
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD1 10664 bytes
font_02_sfnt_off0000f4f7.bin
c258c29ca0e1575f4fc171f598056557d2c38876999dad7e05b928d6c09943bc
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F7 17260 bytes