Malicious PDF — malware analysis report

Static analysis result for SHA-256 d15828690001289b…

MALICIOUS

PDF

82.2 KB Created: 2021-09-02 00:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b4d833b4cda85f0f5e2079634ef3d2ff SHA-1: 36ab78522bb85146aeb4eeb5a89d340a25e538d7 SHA-256: d15828690001289b2a583acf8ac737e97a0f8d9660e42ed31ae080fc3232bfda
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://inwebjor.ru/uplcv?utm_term=structures+as+function+arguments PDF link annotation
    • http://w-mill.jp/images/file/15303261960.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/vubagamorun.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/tulakowu.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16080bdfa17573---6870635291.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/op56puoh73e9a55d8dunfmbhpv/nutimukanarazizefuxodufav.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f038c737d1---timadajo.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e7e70965001---32986118909.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/fuvebalo.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/laraseboxebadoda.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05fef3429d---duzeferaliketoluximokuno.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/8c84be46b97c53ba30c72309f1a6ad56/lozeli.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/jumuwexuvunuvoga.pdfIn PDF document text
    • https://bgmediation-flm.com/userfiles/file/wijuwo.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/vomagoratupesegakudo.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/22527158833.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2f3cf046a---nurikazutumeliminosop.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/wazizaladipinikiganeg.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/xusoxuwazegiwekarale.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608877e4f144e---lefabuvezeverovuvofomafo.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/41504353560.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/53305432103.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/92245932588.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/e35a0b5676d20526b04fd1f8e4b3159e/69861924095.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_off0000ddec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FE 16912 bytes
SHA-256: 4f0898ba230dd445db1c38aa44958a4c8f40abd4deff2e6e815cf6b505bf425e
font_02_sfnt_off000121cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CC 10808 bytes
SHA-256: 09604a473585757fe80461d9763e56a34f7c92e667a874c985a786a0ce19c4a9

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