Malicious PDF — malware analysis report

Static analysis result for SHA-256 c063727381dc35d1…

MALICIOUS

PDF

80.2 KB Created: 2021-09-07 08:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 15fb53d6b268f5ca0dfae957136dcba5 SHA-1: a4c4e4114355aef49ff98e517260a3798ed5a659 SHA-256: c063727381dc35d1dba71040432c60046627589855ea16a214ebcdc0437ebe69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nomylo.ru/uplcv?utm_term=business+english+vocabulary+games+pdf PDF link annotation
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ddca3036c---11483857393.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/kelafufulawerix.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b191b13df0f---dujem.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/79882091643.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/mubunokipugobuvokipowun.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfc6c0fc60---kafebafekegufibar.pdfIn PDF document text
    • https://zhansq.cn/upload/file/vevufowu.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/gijegatase.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/46019529399.pdfIn PDF document text
    • https://angkaganjil.com/contents//files/33241228263.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/nutigabelepurifuvu.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a49a5a625f4---gatikuxakari.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/44902786303.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/lasawaded.pdfIn PDF document text
    • http://abworder.com/uploads/files/jebitodanemoju.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/c83fb9a4c6e70bff51d2daaefe83ec94/38772662702.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/wubiwajovofegezinifar.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/xumemujifogazu.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/d3027cbe0fc80388c298929f0461ecca/55684465359.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/1808287419.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/fumanejazagawaxivepe.pdfIn PDF document text
    • http://theettiaresottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/sewamadedomanipef.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/77796013839.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/rqhet23jipku6sfjevld8dd24l/junujisanazitamiwogijo.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_off0000d773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD773 16276 bytes
SHA-256: abcdc3157a229eb9e313ea532b8aca94bb85e05d68a051a0980d212e6ed667f8
font_01_sfnt_off0001016f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016F 11444 bytes
SHA-256: e91faaaa2407a30841a363a54c00c01e0930a11ab2c8f9c8f636a67a46af333d
font_02_sfnt_off00011bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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