Malicious PDF — malware analysis report

Static analysis result for SHA-256 20de8f8b0bfd3b19…

MALICIOUS

PDF

87.4 KB Created: 2021-09-01 09:36:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8988bd8c654eac4543849410ef83b756 SHA-1: 77a11bbd7a0e56df99470f33ad2c658ed2ffbbb3 SHA-256: 20de8f8b0bfd3b1901bafbd26b07caa4fdd6108aa99b5d178740b5bdf5e5a475
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. Heuristics indicate it's part of a link farm pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further payloads or revealing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

Heuristics 8

  • 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.
  • 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://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/fe5d1723a0d6cb2f05d59315b67bdd0b/derodejumopaw.pdf In PDF document text
    • http://espacioschillout.es/images/admin/file/mitetugowisotax.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/kodos.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160838abea20ca---fafaterugudowitoripe.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/taxadewu.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/30051760773.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/wunapenimeminonozizesi.pdfIn PDF document text
    • http://grapevinewinerytrail.com/clients/876125/File/93035443516.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/gaxebikijema.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/jopejevu.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/9416541633.pdfIn PDF document text
    • https://egca.fr/userfiles/file/90270169788.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/lekagegamimoborigexuj.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/db8273dad9d20da9daa25772b99f1833/91290433636.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16078b14c8bd1d---gijezuga.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160f39901e064e---vidonew.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/malerikedegigosi.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/dofodufa.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/a2610f5577b6817641b808b067c92df7/77315952373.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/49o4rkt75kknarp82816sjn7bb/zajesimaruv.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160acad569f44f---wumamu.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608731cf5f763---vavutolibogonavomi.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/sikifugikevidikexozu.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/29515368464.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/9b57b0235ff7430ecfe9de31384f7a8a/xoguxada.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/duvunolosetuvexovelafuzar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=notes+on+ifrs+pdfPDF 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_off0000ea9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9E 20656 bytes
SHA-256: 4afae8e7d748a809f85688a7a8a96a22dd18154f1b6d52c9100a554b4f079316
font_01_sfnt_off00011f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13788 10260 bytes
SHA-256: a784fa6fdc991a02306831f2a0b3f3a8d1ee75452f1608206035576f86679367

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