Malicious PDF — malware analysis report

Static analysis result for SHA-256 de0adc63bb62af94…

MALICIOUS

PDF

80.3 KB Created: 2021-09-01 04:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e8593fe0fd18b94647f2204de7c13991 SHA-1: 67caeb4ab69e8741930d3e0da1a78aeffcc53591 SHA-256: de0adc63bb62af943240cd10fbf1c92e83707f4506a08691cefb8ef08227007f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a callback phishing or tech-support scam. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting an attempt to distribute malicious content or redirect users. No scripts were extracted, but the PDF structure and embedded URLs indicate a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • 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 http://maihome.hu/admin1/file/86841608202.pdf In PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/rifomo.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/badigapab.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/majimowojuxe.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/piketenelabezofarem.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2de8748ead---53177761737.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/detasikijobumenojavobi.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f563d65740---xedevajidaxigemosewuk.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c066ec01cb9---78781171208.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/bbbcc8cb426869cd8df34520ef2f5a8a/88541198144.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fa80cda804d---mipizinefezig.pdfIn PDF document text
    • https://yz-yongzhong.com/upfiles/editor/files/zibut.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110b8f2b2949---80127149059.pdfIn PDF document text
    • http://koutingchina.com/upload/files/zulajudox.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/4894501289802458065745f42fa46369/lazuxewexubipu.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/javepagapoditejasamepiwo.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/19603217970.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/devokugetefozukunu.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/fivogajak.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/89b5bf9ef0fda5382e4d5ec62fbdc792/xeluj.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609de97a99f96---21827235790.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160b13764b82fc---wewin.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/27106398099.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=track+by+bl+numberPDF link annotation
    • 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_off0000d967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD967 10324 bytes
SHA-256: b7c541bd3ab5fa5012616d4351e443ae6a07a4e04f8c09cd1328391f4b033563
font_01_sfnt_off0000f0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AD 16532 bytes
SHA-256: 6149c9d647e9061af04e5fe61a3b538e9a5695758cfb88881d0b63c3ad5bc284
font_02_sfnt_off00011b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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