Malicious PDF — malware analysis report

Static analysis result for SHA-256 73edc192d59229d3…

MALICIOUS

PDF

86.2 KB Created: 2021-09-07 22:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c972c3e57902be16c5791da6e5a09609 SHA-1: 717b928fd2fc647fc3f61e7751e3749a186b5a73 SHA-256: 73edc192d59229d326a123bc46b1e736ccf8dd4fb395d039caa1dea1f905d19c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggests it's designed to redirect users to malicious sites. The document body is heavily obfuscated, but the heuristics indicate a link farm strategy, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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://hizlipin.com/calisma2/files/uploads/5359561954.pdf In PDF document text
    • http://dajuicebarus.com/uploads/files/31531822976.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/zufazegexuseruk.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/musigatorikew.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/55766784055.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/b017c123a0cef6a713ede7ce09dc7638/susubozuzuvonutumeviguraf.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/87087325614.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/6f5bee8819dd9a1f249316c477aaf2c3/vixixawoxaderafatami.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a71f157f5---xasibajopudalos.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/15206902683.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/7588762010.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/vpififtm88mkqaajkm6km9s1n7/nibigofawozusadeborurebun.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/a3b2239d94843379d573ce2e4bba3497/mukuwijivekawokurabap.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/texizamusibomedebasuworun.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/d312bdb16170cdde14124ff4559aaa9e/raxanenonakuxuwi.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/13185593038.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/gijesemutewumufo.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/17352069836.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/darezemufazigizuva.pdfIn PDF document text
    • https://schmitz.cz/res/file/68828608076.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1607b25242453c---sizunivilasufipugeruvifub.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/33362429602.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/emrs0fbullin422oqv8nk1bren/40212822725.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/52439396465.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=fall+cloze+worksheets+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_off0000e7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB3 19624 bytes
SHA-256: e79ec7b54b0f72d11036755a5d9c0f921014a0335a91ef842e7e5f684f9bf38c
font_02_sfnt_off000131d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D7 10736 bytes
SHA-256: 9913125eb3613e1104a0afde05f64c265367dafe3f6ee284ed8c3cb983d8977e

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