Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba77de7387805cd3…

MALICIOUS

PDF

81.3 KB Created: 2021-09-20 03:09:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: afda4e32bdd1b54b45ca289bd232bd7c SHA-1: b8a1383dd13f6ebc8b57cb50961817f604971537 SHA-256: ba77de7387805cd372d662d525ea7c6e615538972c02eafd1eb6d78db209fb46
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links to external resources, many of which are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to distribute malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the download and execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=go+goa+gone+movie+download+filmywap PDF link annotation
    • http://stressmanagement-karriere.de/userfiles/file/jowul.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/90317217617.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/21130271616.pdfIn PDF document text
    • http://zatacorp.com/upload/files/28800399400.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/36246007649.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/lowubasavebededugenopoge.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/2a7e26a2911ea253f91319d645955104/96005933571.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109060052139130.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/453c1a0250f945798ffb5d8e184afdbc/dujowafaxunigogirati.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/kazelusedazajibel.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/61854473959.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16147bcc7e20d3---bewilomuguvodoxakizenepo.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/pojutawewikesepedomafom.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/bawagaw.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/rozakos.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/kusunivuziru.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/wojewepulekaweket.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/ganuwodoxeleva.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/dowirumaxiluzelujuvila.pdfIn PDF document text
    • https://tkbhanna.com/ckfinder/userfiles/files/pamewaramotogajekano.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_off0000da48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA48 10780 bytes
SHA-256: 3f290bf8b0cf56e3ff779f98d15311184ba30882a495a963d29a555077b8e2da
font_01_sfnt_off0000f2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F0 17692 bytes
SHA-256: 32ab5aa896b6daaedce7af29f728b56aca5c55322e40abaaf3e5429d20be04de
font_02_sfnt_off0001203a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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