Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cf274b6968d151f…

MALICIOUS

PDF

80.4 KB Created: 2021-09-05 21:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6183511d911956ed0d23a864f875dcb9 SHA-1: f25f5dd1c11e1ab54abfaad972103c6bbb63b381 SHA-256: 8cf274b6968d151f14c53d82f1b64fc4d8bc9ac1df1cbff044179ab12a688a7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://synerhu.ru/uplcv?utm_term=capability+curve+of+synchronous+generator+pdf PDF link annotation
    • http://orrizon.ru/images/file/28422545527.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/0jo1r4v1475b43qncu6raenq63/kazokerafipaf.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/pevuligiboridixofoxog.pdfIn PDF document text
    • http://ndt-ultratech.com/files/65153361944.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/vixiromutotakugukiravu.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608502f07c144---46416319824.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/34443419295.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/202173184751.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/dazemawulenenel.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/kimegos.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075caf9b2110---97211358403.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/n2nluu608bc1ok90j5jqsalrm3/50634691600.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/ivq97c3vio1ekn58bsledi7ktd/93675403652.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/wivetivupifuzuxavetekide.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f998b01c5b3---jiwafazivevuwefimesi.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/51615890397.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/25934420140.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef37a99f1e---wabegupuwonapawasitaz.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///53976705465.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/wupikegagofofa.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/pifuje.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-23/20210523124732122197.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_off0000d177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD177 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE989 18440 bytes
SHA-256: 7b863ff63d33c4b4b90de5a7637eaecff39aa3de98646f775bbf558bdaecc463
font_02_sfnt_off00011994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11994 11352 bytes
SHA-256: 8b0928cd25d2fbe695dc564c8db0b11e344170f25bb0c3d200dd3723235e92bb

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