Malicious PDF — malware analysis report

Static analysis result for SHA-256 df10f8d54b4bdbf6…

MALICIOUS

PDF

87.7 KB Created: 2021-09-07 00:35:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 50831b2e1e38d64359b3a0940d665f11 SHA-1: e01c211d84fa36dba7b268142cbc255bd8a147ec SHA-256: df10f8d54b4bdbf63d3d08be17c6c8208d671d0f33962b69ca2180d705513776
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to compromised websites, many of which host other PDF files. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to trick users into downloading further malicious content. ClamAV detection confirms this file is a known malicious PDF, likely a phishing or trojan variant.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aacd9d3bc75---lixemu.pdf In PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/teduwurumuzunimi.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/6b0bc7a5a8f8b06480835e6f151e14c0/tufigovirepipozuru.pdfIn PDF document text
    • https://lanjutpt1.com/contents//files/kifovuwumovugep.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/161235fab44e73---xodolameroregikexamija.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c4960335e75---kuwiz.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/11981102886.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f4342e5b4---52969193448.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/gaxagesu.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/f04cfa75bf2726dbc75ad1dc9951bf91/75292681436.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef1a9eedd5---vilipozipimijamewazosa.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/34828596716.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/5e8eqe05unpi323ev9koum46q4/73596990138.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/dokomesogopuwabafas.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/lolokoporubugepuda.pdfIn PDF document text
    • https://carlojans.com/cms/file/gafipesudejivofexi.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/2042954041.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f98c762fa8---sasiperufibag.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/ladakorix.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/94001792302.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/xerofegukabadoma.pdfIn PDF document text
    • https://hijaustabilo.com/contents//files/82254596872.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=narrative+writing+worksheets+high+schoolPDF 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_off0000f298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF298 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAA 17656 bytes
SHA-256: d141e4b0f37116bcfc93000c9797ad84e2faa0f7d5b5079ec6d3dc3f84cd1602
font_02_sfnt_off0001384a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1384A 10732 bytes
SHA-256: d36d254ecdd4dffdb68b70a1420279a4292f83feeca2bd00ff022f4b9e07639f

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