Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c7cdb0d6a666ff5…

MALICIOUS

PDF

78.7 KB Created: 2021-09-16 02:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 952e80e46a7537301055dc8f7210e38e SHA-1: f8b56f4c2d8381831ac6727bd25b3b09b9dc4738 SHA-256: 6c7cdb0d6a666ff54fd4dbce06584ba02ba559671ed3d88a081d595a97bc9e7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to potentially compromised websites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' point towards a campaign distributing malicious content or phishing pages.

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://medvor.ru/uplcv?utm_term=windows+7+iso+service+pack+1 PDF link annotation
    • http://crystal-lamp.ru/uploads/files/85228994697.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/22765766034.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317eae6d540---dipuzu.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/49c8a5c3d48738b3951f9c933bbfc79f/kidarebaxuzoju.pdfIn PDF document text
    • http://xhzhengli.com/upload/37731676088.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/vugukeginerirokaseguverop.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/45925896248.pdfIn PDF document text
    • http://xn--jt2b56wn0ap2a.com/upload/file/202109152129226199.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/9343902245.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/fejexalilowekadopiza.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/70801929258.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/14704339601.pdfIn PDF document text
    • https://harmony.im/userfiles/file/82530279836.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pivapajuwila.pdfIn PDF document text
    • https://retta-bg.com/userfiles/76414709837.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/87513957209.pdfIn PDF document text
    • http://kondicionery-pushkino.ru/upload_picture/file/jifudaburazegisolatumuded.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/ravunozapokejasuzevemopo.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202109071125578441.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/72376847341.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/50118082237.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/lufesetitozepo.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/gakawadisobixuzowekow.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f93a41535d---91758434908.pdfIn PDF document text
    • http://www.polni.si/Images/files/5644453844.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_off0000cf44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF44 10704 bytes
SHA-256: db3afc922233e079719cb1519d9a0ee738aa8d2cf9b8b48abd5c1903636c15b0
font_01_sfnt_off0000e816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE816 17276 bytes
SHA-256: da82b6c43e0d15dcbbcd246dc8064bcb444e1ff4117555b20c8b56d32d9bd93e
font_02_sfnt_off000114aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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