Malicious PDF — malware analysis report

Static analysis result for SHA-256 b61022fcf1cd52ff…

MALICIOUS

PDF

85.1 KB Created: 2021-09-03 10:04:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3bac16a523453443f5667a91283903cc SHA-1: 82bd9066e4d2695f4d79e0201634cbc2c57c9d4e SHA-256: b61022fcf1cd52fff23a64b707029de5e2eb7cdc5ccc1f18662c04154958aa96
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, with the file being identified as Pdf.Phishing.Trojan. No scripts were extracted, but the structure and URL analysis point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/1df247536579697091c5081eeac3741c/fomediwuvonupoxegugak.pdf In PDF document text
    • http://ndc-group.ru/uploads/files/sopazifovubaxa.pdfIn PDF document text
    • http://cga82.com/admin/File/nonew.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/tiputelamabuvesosovosu.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c28cefcc115---34691774558.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/fapapesizafozisuda.pdfIn PDF document text
    • https://angkagenap.com/contents//files/tuzunafenuduger.pdfIn PDF document text
    • http://ruizhishengwu.com/uploadfiles/file/281504558157.pdfIn PDF document text
    • https://baongochoa.com/upload/file/pajifoxeduwosorixun.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/sorab.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/kosokosoxabofeduz.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/rumuxobidubufidejikid.pdfIn PDF document text
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/31216782098.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/gasasolisevipaxamaj.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210717033101178.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/53207262003.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/vikobusafubotide.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103018d2a87c---2197645071.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612dbf65ab705---94018150818.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d1cef169a4---besafofavuboxe.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cca9802a8f4---bujiluf.pdfIn PDF document text
    • http://xn--80aawifdlfr.xn--p1ai/ckfinder/userfiles/files/pofazus.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/5270681884.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/k26db839jc2belbam1uc7hl2n3/rufup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=japanese+n5+grammar+list+pdfPDF link annotation
    • 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_off0000dfa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA2 20988 bytes
SHA-256: 12bc7432f22abb76d0653a9871730ead3dcfc13eb941b76defc36629bc5f96c7
font_01_sfnt_off0001165a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E71 10844 bytes
SHA-256: 5f142cdfc773227ee0681170d009a264610938805b343453685087fde581c9f1

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