Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ccfde189523ab77…

MALICIOUS

PDF

94.9 KB Created: 2021-08-09 00:42:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 94e78cee5482f8fadf0fb1817104dec8 SHA-1: bec6453622c5af563d1d613759b2341a94373103 SHA-256: 4ccfde189523ab7743893bec2df4e9e60e1c5657bc2f8a69e262d3f79805134c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous embedded URLs and link farms point to external, potentially compromised, domains, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the document is designed to host and distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://inwebjor.ru/uplcv?utm_term=fraccion+generatriz+de+un+decimal+periodico+puro+negativo PDF link annotation
    • http://jysfh.com/upload_fck/file/2021-8-6/20210806183549768364.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/0btmjhi29ekhqbo7hn2rt3rt0h/51414551741.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/pojunuwo.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d77887501a7---levuwekubulu.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/xaxifijidolikaviriwal.pdfIn PDF document text
    • https://activepymes.com/pub/file/36046631134.pdfIn PDF document text
    • https://tanasiri.com/piceditor/file/pasirebawis.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a35c64bc3ed---89942333463.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/762ib5gl8utcb2qgn19e4ue4k9/51450247224.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/28136185865.pdfIn PDF document text
    • http://inlygiaylynhua.com/upload/files/49064700957.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609485376c798---68388059541.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/mimebibumiridibige.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/dugodab.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/a77bd3500d2edcdde5ff3e78edaa7597/83102638025.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/1e567341edbf79ead6fbaa36549ecc72/44376946518.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/22683b7a19d724a96c385c810b958c4c/xekubibesi.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aec71866c9---mewulusunid.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c909ce08b9---27806849490.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/8cpoa8ueoh1chk472c2nf7r1jt/pakinoju.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/movofefamerotomovejab.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/diwuku.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/63590721949.pdfIn PDF document text
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/47409043310.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_off000105ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EE 20036 bytes
SHA-256: 10bb39ae9d4f9245d5208b8e943cc21672968c16fb2d75b18614aaf6abb33fa9
font_01_sfnt_off00013a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A70 10892 bytes
SHA-256: 56b451ef46220a39de2b04123b180c76acc7170feadfe669995ef4c9514b77b8
font_02_sfnt_off00015375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15375 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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