Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cf327f0eed19077…

MALICIOUS

PDF

84.8 KB Created: 2021-09-09 11:37:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 37c1698a54e6191eb3738af63b03102f SHA-1: b4e04bb56cfdfa2e92df60c6463c0ca7238eada7 SHA-256: 1cf327f0eed19077c452699123d90bffb333432da59252187df09e60a6f8b730
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The embedded JavaScript is a common technique for executing malicious code or redirecting users.

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://terracetemayonetim.com/upload/ckfinder/files/vinezorumaxitatur.pdf In PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210904_3BD31B600A576C17.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/wavomugajijezetino.pdfIn PDF document text
    • https://sharks-cz.cz/images/file/meviz.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/6677008294.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/sewobekava.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/jovenitetuzuguvipuwotor.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/161325abd54a8f---zomanonum.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a62cb1fac---57932121792.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/nitateg.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/bdff8c89d5862c26002cc82fa164d113/dazexefimozil.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/lilulegovuweme.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/zekujosapunepujejudaxiga.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1630893343.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fa4ca5f36---21237822799.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/39790371111.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/83847979189.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/34224581809.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/naxuxi.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613124ae2d617---87214800481.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/49868253859.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/virozekipos.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/23105944655.pdfIn PDF document text
    • http://prosquash.by/data/vasojipazat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=fuentes+y+medios+de+reclutamiento+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_off0000e481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE481 18488 bytes
SHA-256: 46e1840470a5d2c441bf6cf80501afcfa5294e134df72c44e7acd152863cb0a8
font_01_sfnt_off000113d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D9 10972 bytes
SHA-256: 94838f2514c833e746d0812932b3b5f6a3070effb505d5527525734755b8938c
font_02_sfnt_off00012d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1