Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccd93f969e862060…

MALICIOUS

PDF

84.2 KB Created: 2021-08-20 20:28:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 26fee4e24a845a70dfa0866dca076635 SHA-1: 7bd1e9b80d0313ae123c348370ba69ba63d112fb SHA-256: ccd93f969e862060271fba6091fda5d68541f6f1b0a2c77c3f0f54d17d87adc1
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and contains a callback lure, prompting users to call a phone number for fraudulent purposes. While no scripts were directly extracted, the PDF structure and URL patterns suggest it is designed to facilitate phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75511613162.pdf In PDF document text
    • http://3dprofi.net/images/uploads/file/barudajo.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/a38a750b793767e445d749404a5dc9be/nofolojewanefinudazem.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/2ec5aa0a7eb1990c974af4ae0837a96b/taruxojimazalifi.pdfIn PDF document text
    • http://fittbikese.hu/files/file/gojobonifum.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/vurolowerujexovomona.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/0b194000b6f3f7151df40929f59ee45c/rurexajojivikozolonowodel.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da7f3d7467c---90154811415.pdfIn PDF document text
    • http://twothirdsmajority.us/clients/38522/File/zunafax.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edd43de5bcf---garafagisixuzanixijufunul.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/67980161867.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160edc5b6a723f---nijexoduxewutarebaz.pdfIn PDF document text
    • http://computerdoki.hu/user/file/66132407802.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/72944349951.pdfIn PDF document text
    • http://myucpb.com/userfiles/file/xojufipufopakiwij.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/laxobejoditamimokejib.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f698291d37---basitexogefozumamajozire.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/tovimabikup.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad23c9997c8---fatukefatajinekumurogor.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/korojopalaxuloxetetewat.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/88657258391.pdfIn PDF document text
    • https://basisnomor.com/contents//files/guwekuzumij.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/7iee617l9stdad6ti0ut5389q6/70177404512.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/8b59a322a787f6fd0a69a86f5bbbd684/62485094611.pdfIn PDF document text
    • https://hsse.cl/files/78457937291.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb60c41cf1---79320047741.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+connect+bluetooth+to+nordictrack+commercial+1750PDF 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_off0000e4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDA 16460 bytes
SHA-256: febbd5a56ba5bd1a5a3b610946274a8c2217211d40eeb37d2446b5a669c75466
font_02_sfnt_off00012783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12783 11232 bytes
SHA-256: 2f6c574189fcd7ac517c01fdaf5d343a618259ee52feddeef6ea78b5c64911ca

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