Malicious PDF — malware analysis report

Static analysis result for SHA-256 431c7663fc397bec…

MALICIOUS

PDF

83.9 KB Created: 2021-09-16 06:34:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 737d1cd0f8aced47da87b879da0de150 SHA-1: 3cb46d1c0bef4c74c08c0b05153a540f548b26c8 SHA-256: 431c7663fc397becef137a5963889a89b3e32057e348e56f80d9efc32945a634
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The embedded JavaScript stream and numerous external URIs, including those hosted on compromised WordPress sites and disposable domains, suggest an attempt to redirect users to malicious content or phishing pages. The heuristic 'SE_CALLBACK_LURE' specifically points to a callback phishing or tech-support scam pattern, likely using the embedded JavaScript to facilitate the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=restore+deleted+call+apk PDF link annotation
    • https://legyenegyjonapod.hu/userfiles/files/xojon.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe338297a4---45552759330.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210901082054.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5180465d4---pobugobixipo.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/93538052067.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/161429e454f8e9---bidenodavibevizifuzet.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/47017012196.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/sexabuz.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/masam.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/83212046943.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/labomasemoliponu.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/xiloridenovuta.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/bigiwev.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/18210460846.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/lepuwidubupisu.pdfIn PDF document text
    • http://namngonviet.com/user-/files/zugaxawogizetozodujux.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210912103142.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/nefuxitumodaxupurelenuzu.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/26391820446d36a56962f55f241c856c/rupamudoperoxegoxefinewav.pdfIn PDF document text
    • http://fitviewer.info/files/file/77455755121.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/kazuzoj.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/widixerilalobojaxizusimek.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613db3bc56d54---26366247211.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/9687d6a1250de34933ffdad11dda613a/nakawobadapejefu.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/voniwuran.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_off0000e16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16F 18520 bytes
SHA-256: 2b19e38dd89772900deba1849465716911082a171d39094a9b85fd4e2a6057e4
font_01_sfnt_off000111c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C0 10448 bytes
SHA-256: 3745df3882852828d37caa9299191ba4814572c1d5a6190c85b1e011bfeeee9e
font_02_sfnt_off000129a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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