Malicious PDF — malware analysis report

Static analysis result for SHA-256 951156cdffa12946…

MALICIOUS

PDF

79.3 KB Created: 2021-09-04 15:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8afccc03d5e0a41c5843cdf19803667a SHA-1: 9a8319f3bec3c9cc6e0722651b0e441a9e48b58f SHA-256: 951156cdffa12946e44090c8af64c6fd0d388bb67d9290db26f9ec654d7c8fb4
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of numerous links on disposable or compromised hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • 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 http://munnarinfo.in/userfiles/file/63364276517.pdf In PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/72673498670.pdfIn PDF document text
    • http://lucavolpicella.it/userfiles/files/tukavaji.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6737deba60---muretizumujikugama.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16074ced8ccc65---lubulorukebubawosodilet.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b186957ea---83645454831.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/26447967639.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/77562152971.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/5c8ab9435292cd815a976cec9da368a5/tosusomimomomurixizek.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/gbr4q4qcmkin8oostta51hffm5/81537473090.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac83e11f94---26444772992.pdfIn PDF document text
    • https://cmoretv.com/userfiles/midevib.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae62a003b56---30964337770.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/5504618231.pdfIn PDF document text
    • https://longhoang.vn/upload/files/53271080866.pdfIn PDF document text
    • https://rajaunited.com/contents//files/16054666897.pdfIn PDF document text
    • http://camwater.org/media/files/safujidul.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/4937f6ef3adf5d491b47eb1a8602e866/72020224342.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/bazon.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161172228c6c3c---73581146824.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/nalojedunivevox.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd51530e8c---mumeporuwujuraro.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/gukafulova.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160829f035d7ff---jaxame.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=funny+maths+questions+and+answers+in+malayalam+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_off0000d016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD016 11184 bytes
SHA-256: 8759b73fae36401923041a16e72210da26ec7b6002cd5f010dca4492b947ce12
font_01_sfnt_off0000e9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F5 17608 bytes
SHA-256: d5c1913dad289219b2c970c9deda53b2c5a53b5509eb9da456d48a86e727b3fa