Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0f4aee8a93785f8…

MALICIOUS

PDF

78.1 KB Created: 2021-09-24 06:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: db7ac1a716da512a3587bbbb1901fd84 SHA-1: 5542ee21c12573ea8b605799edf07b178e75ba50 SHA-256: e0f4aee8a93785f8fd3912ebc4814d493950d4b89cedba761a935efa4c014420
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a callback phishing lure. It contains numerous embedded URLs pointing to various domains, some of which are associated with compromised CMS uploads or link farms, suggesting an attempt to distribute malicious content or redirect users. Although no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • 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 https://oniceh.ru/uplcv?utm_term=assistive+touch+2020+apk PDF link annotation
    • http://www.gesas.it/media/mailinglist/file/miwewitoja.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/18492300705.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/getabuvasixara.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/jebosi.pdfIn PDF document text
    • http://plan.msu.ac.th/ckfinder/userfiles/files/19711655771.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/51412476864.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614164353b9b4---ziwobabul.pdfIn PDF document text
    • http://caramelitos.sk/files/67744256128.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/33892795631.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c84c952e8---xepisowivikem.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/vaxovexowe.pdfIn PDF document text
    • http://sms-dk.com/FileData/ckfinder/files/20210914_CE4C2B8348215605.pdfIn PDF document text
    • https://siroyensao.com/upload/files/89423247943.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/82437646865.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/rurobafopanoxevuzawasovu.pdfIn PDF document text
    • https://viceda.com/userfiles/file/83003994326.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45785165542.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/64812751797.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/28969659182.pdfIn PDF document text
    • http://ipceurope.com/assets/file/fubanonufarip.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/nitisonapizaterewumemudut.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/kepizawidev.pdfIn PDF document text
    • http://denge.aero/upload/files/gikofe.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/rubukuwukuxo.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad9343fb12---61017940278.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/2033899333.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_off0000cc80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE497 10700 bytes
SHA-256: a078025af53d45dcb6cdc9579ff2e88c33c311702438d50125609b796a5651e8
font_02_sfnt_off0000fd74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD74 17660 bytes
SHA-256: f0b994ee0be42c32a7674f9f18c5ba75b4762a1824b029fdafd56278f9ecb90b

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