Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3fc205c351fcf08…

MALICIOUS

PDF

84.8 KB Created: 2021-07-27 15:41:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7efd4f650f04a11cea46ae3c0a813e99 SHA-1: d1f913aaaad85d020f507e3f69ec60518d82fa9f SHA-256: b3fc205c351fcf08ff48cd252edf24595ec919a0c6a29fe1103321f9383d5cbe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://dunakanyarfesto.hu/ckfinder/userfiles/files/33858215339.pdf In PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082518bcbdb0---49764355950.pdfIn PDF document text
    • http://desagresbrts.com/clients/34568/File/besapudotuzilebinipowi.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/22387173193.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/7fc152652e1107c0f0df6679e0995f6d/repusejateferavizakaxud.pdfIn PDF document text
    • http://allasclub.com/campannas/file/7751214119.pdfIn PDF document text
    • http://shihtzufurbabies.net/clients/d/d3/d383cf0c90cf2d2391705d5438694b4c/File/90381217281.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/kadoxozalojebagosi.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/83181422979.pdfIn PDF document text
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/26032181395.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/57696812559.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/11108564972.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/mibozubenin.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/nisisosumunefudaveta.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160751538e3e9f---gipekebagewibapomasujuse.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/682d1af02970b6c8617cece579ee0b1d/nujumitomep.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/45233938703.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608037a0185d9---bofexokiledusobazesutofo.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-7-14/20210714063347968386.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/66548211501.pdfIn PDF document text
    • http://ozona.pt/wysiwygfiles/file/xikenoximikepawokajov.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/38301385018.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=pesquisa+qualitativa+e+quantitativa+segundo+gilPDF 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_off0000e612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE612 18436 bytes
SHA-256: 99d62d26308b0b83f70c9d6da491ca227ac099c1d03cc79e6fc2d912caa34e70
font_01_sfnt_off000112f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F3 10636 bytes
SHA-256: 3335587a2b0378a678bf615b63b269922900d3701b31a56fda062b48cf56f4a6
font_02_sfnt_off00012af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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