Malicious PDF — malware analysis report

Static analysis result for SHA-256 934c5a813d0647ba…

MALICIOUS

PDF

106.0 KB Created: 2021-09-16 12:14:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 06666436d5e708b09d256da7b7687c3f SHA-1: 408034aba394916791c71c3629107329f102343f SHA-256: 934c5a813d0647baf4e37e9ca826b2485e62cd0f805d686b465cfbf481c4ca0d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document activity, likely aiming to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://masukpt2.com/contents/files/19461504327.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/161380d1d63ede---54462469860.pdf
    • https://alshuka.ps/ckfinder/userfiles/files/94226573179.pdf
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/25010946424.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/e28ef301ba80f830097106f2aac892d9/geruguvipidow.pdf
    • https://robustbrakes.com/administrator/imagetemp/file/tazujezezi.pdf
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/vupamiralutibi.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/a503f54c3f9cdfabd59517e17d1e57c1/87852027156.pdf
    • https://mirrorlink.com/public/files/files/xebiwusugeniresalabolada.pdf
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/givomevi.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/e70b1b71978b1155cdd984f222fd7621/83133180379.pdf
    • http://arkystudio.eu/userfiles/files/88351516854.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140924dbba13---23209649182.pdf
    • http://minhanh.com/files/takesezanazabexeza.pdf
    • http://alptw.com/images/files/wagusalin.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8642ee204---vixupufuwoxajitowegareju.pdf
    • https://zmiz.hr/userfiles/file/tepalobu.pdf
    • http://snuhonors.com/userfiles/file/24184485165.pdf
    • https://al-wesam.com/userfiles/files/sibusewufiputerorip.pdf
    • https://am-system.eu/ckfinder/userfiles/files/17942416398.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612efd47ddeb8---vazumuvonunokatokelamoxob.pdf
    • https://monamifrance.com/FileData/ckfinder/files/20210910_868944D7CE78B6D3.pdf
    • https://buzyhub.com/files/galazigovif.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=the+king+of+fighters+plus+2002+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012ebd.bin
8fd839b002d94db702a7b7a10c8ef195ab1b10fd48358eafc5b8fce5b61c7f04
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBD 22312 bytes
font_01_sfnt_off000168df.bin
94d50243956c046ccda57e0437ec9e8433446e90896edf22775dc1f5e200f923
pdf-font-stream PDF embedded font (sfnt) at offset 0x168DF 11036 bytes
font_02_sfnt_off0001828e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1828E 16792 bytes