Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f2465f706d48eeb…

MALICIOUS

PDF

69.0 KB Created: 2021-09-25 19:18:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 36ba5c764f1698121609860440b5cdc7 SHA-1: 7faef4d4b83a831b13c4a6960a9a026e9a7bfb3b SHA-256: 8f2465f706d48eebec6b0cc20425c59808447d0f25756a9fdf8d1b2d610c7eec
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of link farms or hosted on potentially compromised CMS uploads. The presence of a 'callback lure' heuristic suggests the document may be designed to trick users into calling a fraudulent support number, a common phishing tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://huntic.ru/uplcv?utm_term=real+cricket+3d+apk+download PDF link annotation
    • http://mkpstroitel.ru/upload/files/leveraz.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/18324466217.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/wirukamolelogak.pdfIn PDF document text
    • https://cebrigantina.com/025-CEB/images-editor/file/jokawob.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/96669556859.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/kepoweneku.pdfIn PDF document text
    • https://marlschuz.com/userfiles/files/gotijikikadewapozajiva.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/43323535516.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138157454948---gavefozawas.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109241649303386.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e120d50696---xolugevososit.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148bd960fcf4---manepamosilasapojebof.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/tr5ghpcqgq2umpqg1in3fv9vk1/12332962925.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/44687963431.pdfIn PDF document text
    • http://tzsunup.com/upload/56811113026.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/47498593064.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/139863437361359d5af3dfa.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/1980cc4918b8e0ba47b6e483b04c6bce/82913316682.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/5590874746.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/mudimubolowotikap.pdfIn PDF document text
    • http://bubb.cn/up_file/file/23231755858.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/70518650553.pdfIn PDF document text
    • http://bfttacg.marketsearching.com/upload/files/gefosofuxovaso.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_off0000ae2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c63e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC63E 15512 bytes
SHA-256: 499d712e520aa8972e023f75bf3a1941a54914acfe63a373a6f01a524b0c3712
font_02_sfnt_off0000ed7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7F 10732 bytes
SHA-256: d31fde67bed61a26687d7a3b278352bcce9973e8fa7158a559b3c62d803a1cd2

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