Malicious PDF — malware analysis report

Static analysis result for SHA-256 16c9a1c16315d3a0…

MALICIOUS

PDF

80.4 KB Created: 2021-09-11 07:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 60ba0b08d6da6d266a5db5bf850600b5 SHA-1: 2111e3669adbdcf4f7174487d1f0d45b883db907 SHA-256: 16c9a1c16315d3a0b440551ee8af02365e37debac4c5f5e3f4d30a94efa7c57b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting an attempt to distribute further malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a tactic to obscure the true destination of the links. No scripts were extracted, but the overall structure suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gymostrov.org/gymostrov/userfiles/file/gipubu.pdf In PDF document text
    • http://cana.vn/uploads/userfiles/file/dawomujobazedagadafodo.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/jofojiwefosojo.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/20802419363.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/tujuwesixopiwikijaxola.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/maritujiridope.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/zasadunorug.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/37428740456.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/49972518296.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/jafokefu.pdfIn PDF document text
    • http://leeharringtonhomes.com/userfiles/file/4394514647.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/sopuwuzil.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/64175699439.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/89695296619.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161361f6ecb891---fofuwobakufupo.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/pebuxovirob.pdfIn PDF document text
    • https://kaparatt.com/images/File/dusakubadibivatemibos.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/kolezamixepipuza.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/43372751452.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/rixemete.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/5424241026.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/82013700299.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/56935754261.pdfIn PDF document text
    • https://bunexim.dascalita.ro/app/webroot/files/userfiles/files/67489580908.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/g70ircd3bjv36093rcqduqv8uc/vutuzapezej.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae962f024a---38100835248.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=pdf+crop+and+rotatePDF 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_off0000d7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC0 17196 bytes
SHA-256: fc4c6c619e26e2f57c794276aeacde43b86d191a09c17ff0c5f168c8ebb87b79
font_02_sfnt_off00011c87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C87 10308 bytes
SHA-256: 3d741b2c53a3605ad2a1d150eb9503067b44e465657f57ed59862a522867f348

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