Malicious PDF — malware analysis report

Static analysis result for SHA-256 b40cf8464cb882d4…

MALICIOUS

PDF

78.7 KB Created: 2021-07-04 17:35:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 394036d0e6e6944c5fafe94f0021d4a1 SHA-1: 1546c8434ff38c1f720ac06eac60dab807cea8ca SHA-256: b40cf8464cb882d42c2dc19a71031dcdb23cdf49993f6133489dae3cc12f5d9f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that functions as a link farm, directing users to potentially malicious content hosted on compromised websites. The presence of a 'Password-protected archive handoff' heuristic suggests a common tactic to bypass gateway security by encrypting the actual payload. ClamAV detection further confirms its malicious nature, classifying it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/10f40d4f1356770ddd6d25473331a13c/89021644361.pdf In PDF document text
    • https://zemiigori.com/uploads/file/85515517039.pdfIn PDF document text
    • https://kopari.hu/files/file/zabivulodaxizi.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723f161ffb9---jufotujazapotazoxebuman.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/60980441351.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082d15675b4d---semejaxaxefir.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/0d798cbe47dc2ca3dc8776ab3873027a/zedil.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709c8756065---50896971801.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/44181a09a7b51ad3cceaa6a3e449a0ec/ranag.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/kuxiba.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bf57af5bb48---79678874206.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/83451081920.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d628f463809---58241038648.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a890c1ee7f0---fusumapexefutomaba.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c4b853ab0---56062689548.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16077184d3b33c---kokikunadaxogubulu.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a78d83e568---wuribiveju.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/62hi8slphh8bto3jo5nhglofor/ludutawujiluzovinev.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/6109c8e931b41fe72d6dc91e0b98f47a/fanekofifonapozizigitaje.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be094c6a42f---kaxarusebegefararor.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/a651eb3fc9524d7908f1b741d51164e0/dafedux.pdfIn PDF document text
    • https://bdata.vn/upload/files/48030570010.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=reason+for+aphthous+ulcerPDF 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_off0000d235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD235 10632 bytes
SHA-256: a502fad22fa29244fbfbeb57a2053db673e4a729e8494f6d07fa6a7dd7bf1ae1
font_01_sfnt_off0000ea82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA82 16664 bytes
SHA-256: 436cbdf61a633b61fa1284b600a49ce7052fea6b3ef4491270f2380f956f9559
font_02_sfnt_off000115f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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