Malicious PDF — malware analysis report

Static analysis result for SHA-256 b64726a2c6ccf4d1…

MALICIOUS

PDF

68.9 KB Created: 2021-09-28 23:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 11b11f81c84120e274309691ef0ed70a SHA-1: def16a752e333d139f4c59c8d02b4c01e706e84e SHA-256: b64726a2c6ccf4d1784d3663545febbe8aadb740a71644ab7a01d94594329834
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to exploit user interaction, likely leading to a secondary payload download or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614a476b21fdb---bugorofupodiba.pdf In PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/vafivobede.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/mejufid.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/17602780922.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144ca6ad1165---96850784312.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/f72a99a423f66955e61f3542b0080e2d/xavapaviwokef.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/uosgg8t3ts3f4qkakmgd6nlfvq/40957290921.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/vamaxa.pdfIn PDF document text
    • http://houtackers.nl/userfiles/file/59231499560.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202109210542485039.pdfIn PDF document text
    • https://phnews.ro/files/file/97766267723.pdfIn PDF document text
    • http://fourfoods.com/images/files/92425255563.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/61386868874.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/59177566280.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/14816979306.pdfIn PDF document text
    • http://temple.mo/userfiles/file/83226814707.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/23991852040.pdfIn PDF document text
    • https://turbooto.vn/upload/files/72098605863.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142fe9c98d07---26245396935.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/16944445830.pdfIn PDF document text
    • http://contua.org/userfiles/file/18388113121.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/fenusutav.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613694814cb52---gepunuris.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/46417794636.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=android+login+and+registration+with+php+mysql+source+code+downloadPDF 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_off0000aeb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEB3 14048 bytes
SHA-256: 000201028d55b8e91b63a68a09d35f2c3112cc3b9df5d078da6b45cfbe4ffdf9
font_01_sfnt_off0000d136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD136 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94D 11388 bytes
SHA-256: 2db52e59a010adef2a6ce53819a8be72e67d5e027da173d775c569445260f2ca