Malicious PDF — malware analysis report

Static analysis result for SHA-256 7afdada24123c6df…

MALICIOUS

PDF

83.1 KB Created: 2021-09-03 02:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 83f220614f66e7ac50db5c486622740d SHA-1: 6f7a31fec894545525dab715fabc81f6303a0697 SHA-256: 7afdada24123c6df74cd8f44474dce51b1e5b8d27f96eb41a5091c99ccdd901d
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the heuristic firings and extensive URL list are sufficient evidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://ketchas.ru/uplcv?utm_term=clothes+worksheet+pre+intermediate PDF link annotation
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce01f41382---17660350354.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/2m750l4gst6oa1vm072t2c3sp7/tugokepajeziruguzu.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/g1f8oka433a278klepakioop96/63037244894.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents//files/vuwilak.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210718164336.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/xagilovexunokowizo.pdfIn PDF document text
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/h8amj4a0tlav2ap270hmnc0hb9/jigipuzalujomajasizonuvaw.pdfIn PDF document text
    • http://orthopediedelft.eu/files/xirotuxufesejenotor.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/xikiwezosetonupawoxalewij.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/43104726213.pdfIn PDF document text
    • https://best-label.com/upload/files/31787206754.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f39ce177e6---72436126084.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e206ed476---febigabizonutevosusi.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14c2ad387d---4542599904.pdfIn PDF document text
    • http://congtydaihai.com/upload/files/tulixemibanakuno.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/golipom.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/jogobovoboforovetevivu.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/9e876381777ced0e5cf972c37003f73b/73352316794.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/xawubuf.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/27072243110.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/winakalusikexemapafog.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5fe9eee44---funamuxel.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606f1727d2d3d---nisezowovajiru.pdfIn PDF document text
    • http://maxbrio.kr/files/files/walodi.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/95260809636.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://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_off0000e4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB3 17316 bytes
SHA-256: 67d2563842e5fc9b1866bab9bfa77bf6803983aadabd1ee81e837591cf543d06
font_02_sfnt_off0001294f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1294F 10868 bytes
SHA-256: 1678fa9d1a4a537b392482db3d258f039185bbe8a269d4e64bda18c7516d3a72

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