Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf5396c6a7ec5db2…

MALICIOUS

PDF

78.7 KB Created: 2021-07-03 11:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 80443e93f4bed4eb939b851f6d4f23cc SHA-1: e589001b0b7cb417657a9677573ca6f70a5905a4 SHA-256: cf5396c6a7ec5db20a82457642a960f4d0a6fa42764dea98ef09c3637a698f15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating a phishing or redirection attempt. The presence of compromised CMS upload links and disposable hosting suggests an effort to obscure the true malicious destination. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://infrive.ru/uplcv?utm_term=class+10+biology+study+material+pdf PDF link annotation
    • http://ubestsports.com/imager/files/20210620095201.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5994f42021---37975074872.pdfIn PDF document text
    • https://2acontractor.it/images/file/59664323859.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/qj5f76tglgmckah3jrg4ksvhdn/gawipamuvonudositif.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/ac2bfb74c946fe6b7cfe6d454656b11d/965995.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/92644303569.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/62479447112.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/h2rl3fn0jktlc68c6evebp2tvh/fuxowuzi.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///86948078210.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92be6f6ca---93852766102.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b0130e514ec---26717858910.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c50d7efd0d---benewesebojafo.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/41310488738.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b3887bd23---korenato.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/94646300631.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/orktjsqi54pekljb9j6b8gv5nh/71759409566.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/detanelivam.pdfIn PDF document text
    • https://transit-connection.com/userfiles/files/20175096308.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/pldsft2jhr24bhtsnl60uihbgl/pubifagepinovepexufuwel.pdfIn PDF document text
    • http://bradleyhillsapartments.com/demo/uploads/contents/file/38664220284.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/5117274573.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/kipomuxenukuriwaja.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/kumadi.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/masonilawuwu.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c68dd62f922---viporadelotipenazanu.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_off0000cd3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE551 11296 bytes
SHA-256: bce45ea1e0141e20f377374074b2d4e400fb6e3086bd69a09837213c7f5119a0
font_02_sfnt_off0000ff8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8A 16892 bytes
SHA-256: 19f649e0d903fcb46bc1d455fbfee62103da430937e7aeabd53e9ab33be3557b

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