Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aba594e99e5b952…

MALICIOUS

PDF

119.9 KB Created: 2021-08-11 13:12:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3708f7eb655593bda8b07ecf335c6f92 SHA-1: 061164f6b76022267fac7d549ac1efd7cfdbbe87 SHA-256: 4aba594e99e5b9523ac5ff5e8cdfa690d627684e94a5da898574b88a386a1339
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. It contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://garglob.ru/uplcv?utm_term=amplify+science+answer+key+grade+8 PDF link annotation
    • https://juegosinflablesarizona.com/files/86531571265.pdfIn PDF document text
    • http://1960whs.com/clients/7/73/73384dfd0d582a2861cf356c55c3c578/File/fesuvirigonuwemalukaj.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/e5743a167c1df6e4f2c1dd243cbf4068/lonadegiwetumel.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/pumozefelanosixamo.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/36087515011.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805e65612c6---81076021870.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/78364585162.pdfIn PDF document text
    • http://renovator.cz/files/file/magefozovanipozaza.pdfIn PDF document text
    • https://europartner2.pl/uploads/74615848981.pdfIn PDF document text
    • https://telorgabus.com/contents//files/bekibexoni.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210516073724.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/zilotujovasivaluburobi.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/o9qnv6ds5ajnumhi0g8l415r83/rogapikelorusume.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2ef895cd6---75246086401.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094218e9b61a---44354757674.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/mekefebedefur.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/bumokafunenobarovob.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/fowos.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/863a5db979e7f2e1d25d51a858c63374/33080986940.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/sapuvatigazijejesidaleri.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4165328d6---vetepakejokig.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a61dcca04---dovitolunigegeparavisu.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_off0001658a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1658A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DA1 11228 bytes
SHA-256: 9507cbe82163bfd68727f26aa832428d70e1ddff69480e34c602893adae8b0e1
font_02_sfnt_off000197c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x197C4 22436 bytes
SHA-256: 3d20d7df3f0c599e0c8bb940bfec0859d9a4948e937fe63d7fd64dcb0c88436d

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