Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf0c19e4e3b3b82a…

MALICIOUS

PDF

81.1 KB Created: 2021-08-02 10:30:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f54b066e5292b1e6adb0c334ec8ff860 SHA-1: 855f748a1cfa717d6f05a0f1e94bf7d064ad7119 SHA-256: bf0c19e4e3b3b82a01e2dcc57b4b34924d98ba61eb1758b43b05e4789b6f88a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple disposable hosting domains, which is a common tactic for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/ijugqmahp746ngd96hdgu0rocn/zigojaxanuniduzalotitok.pdf In PDF document text
    • https://securitydm.com/slicice/file/texijowuloduvifuf.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/684b35a24b4d179a433a40a9c054029a/zebowesujebili.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/95312846858.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/newoletawixekesidofiz.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/6539980730.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78707054757.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160795e26d2ec7---55741770898.pdfIn PDF document text
    • http://vitaminyplus.eu/files/file/95789757066.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/5b937b7197dad25052a0373ba9548d7e/jokawudowot.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/pajavobuvot.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076a1fa74e3d---vatodivine.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d65315beca---50479390663.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/pupobagifomasusoror.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d721681ef4---65549470973.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/e9b927cbd170c726fcd5254966949bf6/tazapawepage.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/3fe6m2qafds7m5rbndgavjckrp/zimosimuzuxuxiwexiz.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/39504162336.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3c0148cb854d4e12bce979e65a31706c/sebatotijizokavod.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/rojikorurefoxokejuko.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/gatimi.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c798686a84b---buturenejur.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a519cd2e23---zijiduxeruzime.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/24030587801.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ae0d6fb55---10634090937.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=broken+wings+sik+world+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bbda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EB 18888 bytes
SHA-256: a5431f759b9f45de8f0449dc5d118928e19712254f883e9e629119dea4a1960e
font_02_sfnt_off0000f23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23A 16220 bytes
SHA-256: 0c9fbf781f3bed3b71c1b34a3632245337c60c9d2e5ce6ab7c60a2048d96c9b8
font_03_sfnt_off00011c5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5C 10556 bytes
SHA-256: 4fcebb1dac2f9bf22c670c2db1a64cec765508b023847f8040e60e108d9c9540

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