Malicious PDF — malware analysis report

Static analysis result for SHA-256 20203a6ae43cb225…

MALICIOUS

PDF

84.4 KB Created: 2021-09-02 01:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 75273ad703b81d5f916cd5035e940260 SHA-1: 62ef6493c2cac8464a9d0bc386b289cab5b8a369 SHA-256: 20203a6ae43cb22516a1b22c1bdccde05ec715a2b597e81d41dc2f18f88db2a0
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF containing embedded JavaScript and a large number of external links, many pointing to compromised or disposable hosting. Heuristics indicate it's a callback phishing lure, suggesting the user is meant to call a number related to billing or security issues. The ML classifier and ClamAV detection strongly support its malicious nature.

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 http://gandolfiarchitetti.com/userfiles/files/84506485248.pdf In PDF document text
    • http://ahsaipu.com/v15/Upload/file/202153337532309.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/giwiridezovaxebux.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/18816483724.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/77927322764.pdfIn PDF document text
    • http://abnicum.com/files/file/87733108286.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/dizezakanivaxani.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/72940655673.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///47005399474.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/7c52503bf8748995f0d2c449d5a5404e/93591264102.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f600e3516c---99549675448.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/1138462273.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16086395b032ee---28094983839.pdfIn PDF document text
    • http://mcdanielz.eu/files/file/rozobimomelopuzedosetavi.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/de20fbfcc8f0a6d216bdebaa385f89ce/zejanebululetaranaxalijoj.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/f4ccc9a673886c26a7d7cad06da8e12d/lujanozelol.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a0440853f---kewof.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b18cd3cc08e---73977023828.pdfIn PDF document text
    • https://thaihoanghung.com/upload/files/xosafip.pdfIn PDF document text
    • http://snft.ro/media/file/42192040096.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/42736681607.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876fb7d0f36---xafugubinibabal.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/86590785852.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021051602500229.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba67cfd7b---tenosu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=baby+songs+good+night+vhsPDF 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_off0000e4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC5 17976 bytes
SHA-256: 1e1659e6620c645f95b60518d56846c95ad35b0bc801e2edd95a02361c2d0d6f
font_02_sfnt_off00012bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB2 10620 bytes
SHA-256: 4994d7c4f939d7281ee15833ab64597bdad0b8fd91d2435c0a2f321bdc3a1e20