Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b4454e5ac0a9e49…

MALICIOUS

PDF

72.9 KB Created: 2021-09-18 07:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3c1967095ed217cc29dbfeb42800f1eb SHA-1: 3bb4dfbc8a867de5f32cfdb2e8892b914521bdf7 SHA-256: 5b4454e5ac0a9e49a286523f5a3bbf625c2af827e3eb802f4477f7167a2055da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to disposable or compromised hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. Although no scripts were explicitly extracted, the nature of the link farm suggests an intent to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://queure.ru/uplcv?utm_term=king+brick+apk PDF link annotation
    • https://leise.ru/admin/ckfinder/userfiles/files/fixazibijimujenog.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/24751333536.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/gotirimuzul.pdfIn PDF document text
    • http://sokole-tps.pl/userfiles/file/25301945397.pdfIn PDF document text
    • http://scantech3d.com/files/84621349390.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/01af44ed1aa26dc0f6774ab783c9c4aa/27429411691.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210904_7515C600998B3342.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/sorijo.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nideti.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/706e0f14d76a1ff790b1938038296336/gisumumofaja.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/dokixisus.pdfIn PDF document text
    • https://network-italia.com/file/91196179137.pdfIn PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/gokajujogolawola.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/26339257966.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-8/20210908022042541741.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210918072404.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371c232a7fa---titipiwazusitazev.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/padonatolawediliberuxaza.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/qqek675vdord1rjn93a10b8pv6/35039328177.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137529d92c5f---zusinujefolat.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/warexaxodaketeponu.pdfIn PDF document text
    • https://playworkspartnership.ca/sites/default/files/file/tefawuvidokubema.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/noferabowamogibav.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/rajeduvakeme.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/84027803276.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_off0000ba74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA74 10208 bytes
SHA-256: 7daf52d14891817b1ab339440e39097630960c777fafafcd54ffe2480a122be6
font_01_sfnt_off0000d132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD132 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE944 17516 bytes
SHA-256: 6f45e26e5d23698816b246528c369a02b76aa8acb8523c635dd5918e10b4b694

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