Malicious PDF — malware analysis report

Static analysis result for SHA-256 716fcabcc13ddb91…

MALICIOUS

PDF

80.4 KB Created: 2021-09-02 09:32:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e79d663334ecc79e09111ba315e5a2b3 SHA-1: 6015fd76f55a92353d9d121229351fd2e3992446 SHA-256: 716fcabcc13ddb91f332f12d6953e1bf1ff54f37593c85edc07888d567e30dab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://bbpartner.cz/userfiles/file/niligakazivawojukudujuz.pdf In PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/4ca6120ca4b96e01cd5f1f7978e67051/90023254676.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec06ed6499---dawunivoronaxupob.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/89d07b51dd809ca885eb1a5674bb4bd1/kazigulovomijipe.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/momatunepatesotolevi.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/94194566822.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210814_95970981D9E6850D.pdfIn PDF document text
    • https://fishuntpesca.it/file/gazutugugurukeruteliguru.pdfIn PDF document text
    • https://purefeeling8.com/data/file/38843231189.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609673b839de5---salomuzejeziwo.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/23874037361.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/c9f61bfcd13d5d27bc5fbc6d3ab1cea5/19420103350.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/61190183228.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f2c2609026fb96a61e13052608f249cc/7483560005.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/908126de661cd3385b7e1fa8291048a5/8722284132.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1611daf00e27d7---boselamotedifojulumawoj.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/96586fd41e9df2f5ec3ae648ed72fdba/12912207519.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/lamotidusudavuvuj.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/fovaluxakaxorasokup.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/digixesi.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d84458ad81a---jomefimofirinuw.pdfIn PDF document text
    • http://okulsanmalatya.com/imgup/file/36708733444.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ac24c6b768---23084362910.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/60982870348.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=kc+and+the+sunshine+band+get+down+tonightPDF 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_off0000d4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A5 17360 bytes
SHA-256: 7f444c9610548a4585c1f7557b8121f0091ef62ed14464245797ca840cae604a
font_01_sfnt_off000101dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DD 10820 bytes
SHA-256: 562baaade5fb9bd30b69aa36d65229a903ceca548f5b0120085761ea775d2db3
font_02_sfnt_off00011aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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