Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccbbe7357a0539f4…

MALICIOUS

PDF

100.9 KB Created: 2021-08-26 11:12:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f11c5087c470d0d4a548a946650576dd SHA-1: ac293705ecd8e03d5439b0f36b80cbdfcd8ba44b SHA-256: ccbbe7357a0539f480a1ed26023ab9218a68472b8296d9f14bbad70424618f0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://allytemp.ru/uplcv?utm_term=physical+security+policy+pdf PDF link annotation
    • http://studioprogettoarchitettura.eu/userfiles/files/52382451106.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/jedisisutoberabo.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c83ab59040---10401978170.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a3067ce33---kafowibatujesem.pdfIn PDF document text
    • http://dsagco.com/Upload/file/xalagefogebejuzozow.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/datel.pdfIn PDF document text
    • http://skncn.com/u/files/4241553588.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/vizavakasor.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/d45d1b8777c4146fc94e2474ded8de4d/93857742418.pdfIn PDF document text
    • http://caramelitos.sk/files/65576539044.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/gekiwuwuzesepetofi.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c71c478ba65---tinexugekogawad.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/tomivomamoke.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/cf56bdb70efea85592dcb1f5f5ea62b5/69535405860.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd04bc97917---sokakipizu.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/wuguvuraluvopurixegib.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e11286748---fadowotojanulokelowale.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/662f1aefd80f558989148983ce7d36c5/ziwadifaxuget.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c27cc3cef44---80603996628.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/wobesiriwi.pdfIn PDF document text
    • http://deauville.ru/files/file/totekitowopilapipusubumup.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/fefijowalojot.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/e22cde022d47d4425bceea8e4dfac0ca/lupokukigifuv.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160f5f8a1426d9---nadalitakulamijufune.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_off0001209e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209E 10828 bytes
SHA-256: 2c180edb8731f2a136429d23c510979777d27912e7a3c2e459d5c31c5aa2d711
font_01_sfnt_off000139c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139C2 19200 bytes
SHA-256: 4b1d94ffe24d273c526b6c48bec6237d9a4ec5dbf54eaa41617ed19517719db3
font_02_sfnt_off00016b11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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