Malicious PDF — malware analysis report

Static analysis result for SHA-256 786579dcede565b0…

MALICIOUS

PDF

80.1 KB Created: 2021-10-07 02:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: fac47182100d844aa6ea43d445656c1f SHA-1: 367929cf4805a8ab80855de3d44572ab2a9562fd SHA-256: 786579dcede565b029d128538c560ad9a0a30119768bc77a621872bb195adc11
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS upload directories or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a pattern of using these links for malicious purposes, likely to distribute malware or conduct phishing. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • 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.
  • 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://shastriratanchatterjee.com/ckfinder/userfiles/files/82467641087.pdf In PDF document text
    • https://etcbt.com/userfiles/file/punubu.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/xuzafurewufukegegajodu.pdfIn PDF document text
    • http://dominoliberec.eu/images/file/files/fofiratewukofodunezizel.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/86961973355.pdfIn PDF document text
    • http://wwstationery.com/files/file/91403298689.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/wolujovejibog.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/16875236274.pdfIn PDF document text
    • http://amdind.com/userfiles/file/nidufuzupumogume.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/juselivonelironunurixanam.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/jaxuse.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/illhdlfoe1grmm5vbitmkhpn38/geturobejukalopetefaxa.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/jivovitujebutujetuvo.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/81f56v45mic7kcoom6860g5nik/60344903460.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/77579222580.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/naxinigituva.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/51987710995.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/88535331750.pdfIn PDF document text
    • http://kvrhousing.com/uploads/99380693067.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/90587637318.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/zamedekukizanagakuge.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/39765269724.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/55909028136.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/rixezujavij.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615e106f89bf0---mitituviduf.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/36418057771.pdfIn PDF document text
    • http://www.slappedtogether.com/editoruploadfiles/file/45455112514.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/70702398769.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=taylor+swift+love+story+chords+guitarPDF 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_off0000d0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A6 18472 bytes
SHA-256: ba33bcc4e28adfde875b3a385d98fbda4e261466df38e0a4ac9e6477dcde40f1
font_01_sfnt_off0001006c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11883 10980 bytes
SHA-256: a952c07c0e82a261236f6e66c7fbb4739bb07d13ebc06000c4f1d633ab825caf