Malicious PDF — malware analysis report

Static analysis result for SHA-256 caf95d7b392da1b8…

MALICIOUS

PDF

77.6 KB Created: 2021-07-31 00:17:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 95d4fb658f9bd27d1ecc2a26c7dd885f SHA-1: 4b6d4e2afff5c15098909a5ab75ccd7e138dcf56 SHA-256: caf95d7b392da1b8ecce51fb3ea4a7010cf83f92cb2cbe9f02ee714e647aade5
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malicious content distribution intent. The heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on compromised CMS platforms and disposable domains. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://casaatlantida.com/userfiles/file///zazunosiduwolexibatij.pdf In PDF document text
    • http://broeinest.org/ckfinder/userfiles/files/zuzubegozuzafarevinova.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/a558069669f3e86ad602e9ef8f00fd4e/mafuperibex.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/kebebedux.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/ba7ff01000a38de37eadc345d6231099/89658427377.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/63366693678.pdfIn PDF document text
    • https://go2germany.ru/files/file/20715645616.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/84264939a32fc7f9e0bf4df34c9d9255/39246502813.pdfIn PDF document text
    • http://nature-revive.org/files/file/fodukonalosurekabuk.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/38917361811.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/4b05984032e6f48d56b7fc62333af945/61007233070.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a08e4855655---woxaguwuvokaxupere.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c792db6c2---mojuxosefuzipikezologabuv.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/xaxixodarizewigafeme.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/zevojosokinoluxawemi.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/90950151083.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c27c1f6c2ed---61839060150.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/80835068904.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c5023e59ad8---rubuzufivolizido.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/gasoruxibogiwoxafuj.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070cc88bcfae---xobugomitaza.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/torum.pdfIn PDF document text
    • http://bud-drog.pl/userfiles/file/17520180529.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=bangla+kobita+for+profile+picturePDF 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_off0000cb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB39 16112 bytes
SHA-256: e81758e2ec1f39c675218c9debfb0484395bdf8e22883722c53c90804a6d3b73
font_01_sfnt_off0000f42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42C 10872 bytes
SHA-256: 62c5dc7088cced24d1c86850f8703ba875dc92a2e1f682325fccfb66819a18ac
font_02_sfnt_off00010d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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