Malicious PDF — malware analysis report

Static analysis result for SHA-256 95054c33cf09ff7e…

MALICIOUS

PDF

91.3 KB Created: 2021-07-07 21:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c70e10da775bf036a02632d8f8eb96fa SHA-1: 4b9d9c6695c944d93331a273f0fcc66b53f4279e SHA-256: 95054c33cf09ff7ef4d703763254b51ac136cab2b28e9024f556ba2630eea044
156 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous external URLs that point to various websites, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to potentially malicious content or phishing sites, aligning with the characteristics of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://allytemp.ru/uplcv?utm_term=ou+degree+2nd+year+english+textbook PDF link annotation
    • https://vibangnhadat.com/uploads/files/77234802025.pdfIn PDF document text
    • http://plncse.hu/php_data/file/98014336374.pdfIn PDF document text
    • http://coalcreekcentenary.com/clients/5/52/52f735e63eff8706e1a2a73a20aef632/File/81732401689.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/fmamriib80slffhte0v0jd8q5a/7981786581.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/xukafoviwidutomawovowif.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/ec482dbeda740d431bb01498e331fdc3/3673243099.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/48854899372.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/maxudixuvone.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/79693203695.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e26a053af---94059279765.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/44c3d8b1742841112e228ad99e37c190/dijofapikinipewaminu.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/nexikulabibanekaje.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/1766bdf429c2b85741f704ebc0aaa32e/xizigukumixigorowati.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/e1ceffc163a7fba6f7a92c4eded8d288/bijesuponi.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/3ffb830dfdca702553118bbdf4dfd414/labugunukazisakapidoxaj.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10cc8f3f50---tubavu.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/43d8458e86819277036ece733a21e594/kasadonoz.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac34b911127---roratujatadalopibofoni.pdfIn PDF document text
    • http://446888.top/userfiles/file/jebarunalunemoxigebojite.pdfIn PDF document text
    • https://starbox.fr/img/files/73286111759.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/2a2f1f4df0477e05c3cb2e282dd2127b/zawiliva.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/guxadugafunijefokavarivu.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/011mos7lfsugf3km2jrta1nil1/foxaxuxu.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/47632934276.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7d6bba437---59381966382.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///14124361046.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607989de5473e---47649469205.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/6f72df5a1834099e43b07ceb47aaa10a/ninewadomimitolo.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_off00010072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10072 17272 bytes
SHA-256: a9f16ed4c8bf777c83841debee572a1c06e3f5c77ee0bbce882b90ba8da12a65
font_01_sfnt_off00012d9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000145b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145B5 11220 bytes
SHA-256: 9cca0097094bd4ef018266bcabaeaae3a78b7dbf7f5d468c3f217cb466ecea31

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