Malicious PDF — malware analysis report

Static analysis result for SHA-256 5adf99893a2949b4…

MALICIOUS

PDF

74.5 KB Created: 2021-10-06 15:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 51e378b76c42ae8cf0eba146ac44892b SHA-1: eb71e7cd89a0bedf30e4c161da59dea8b3dd7250 SHA-256: 5adf99893a2949b4b899619217b39a8e91d3322fb06727d06425e15b42afae74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous external URIs and link farms pointing to potentially compromised websites, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate malicious intent to redirect users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://pistant.ru/uplcv?utm_term=are+days+of+the+week+capitalized+in+a+sentence PDF link annotation
    • http://sdhmladavozice.cz/userfiles/file/98969860730.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/44795630238.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1615cf00015e29---winigi.pdfIn PDF document text
    • https://obchodsezlatem.cz/upload/files/godibosefomazexopani.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/87164639575.pdfIn PDF document text
    • https://tl-systems.hu/files/files/33707552678.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba98a2597d---81184825542.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/turawenemubib.pdfIn PDF document text
    • http://lemma-studio.pl/userfiles/file/pegolut.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/zizaji.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/56646501704.pdfIn PDF document text
    • https://bak.vn/upload/files/ligitepapulisovisazetuso.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/zijijavujogof.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615586a94d54e---41970291780.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/gelar.pdfIn PDF document text
    • http://fulico.com/v15/Upload/file/202110101588080.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210911092449.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/desomukazatida.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/nuvawajuzapoxi.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210913175133_697736927.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/8fd2846b97a4472817ee71d87e0acc30/55819048412.pdfIn PDF document text
    • https://inprovitbrasil.com/ckfinder/userfiles/files/61998802462.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/14c72ffe4291edfcbbd16b87188696e0/wajilifuwejusenoseweteti.pdfIn PDF document text
    • 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_off0000ba45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD257 18668 bytes
SHA-256: 63d01f6a84da80c6b2bd1cc2371bd1cdfb8d7964eb9866622cd4d399368e07a3
font_02_sfnt_off00010274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10274 11048 bytes
SHA-256: e35b9313018350b23d9cc63070f5ecd36a378a3122c62da147d6897f0cd5bfbf

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