Malicious PDF — malware analysis report

Static analysis result for SHA-256 1db16fc91c51e34d…

MALICIOUS

PDF

438.6 KB Created: 2021-08-07 04:01:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: dcf2366c90fe85d1c6bfa083fca8cc46 SHA-1: c43728fddac3bdf2e88735d84f4561cfc9e917ed SHA-256: 1db16fc91c51e34dd4dcddc1f524643064679a3246827ecb5da7032f0a47dcdd
226 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a phishing scam, leveraging SEO redirectors and compromised CMS uploads to host malicious files. The extensive repetition of phone numbers suggests a social engineering tactic to overwhelm the user. The ML classifier and ClamAV detection further support its malicious nature, indicating it's likely a downloader or part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8457

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
  • Travel-support phone-number stuffing scam critical SE_TRAVEL_SUPPORT_PHONE_SCAM
    Document repeats phone numbers in airline/travel/refund/support language, often across multiple regional phrasings. This matches SEO/support-scam PDFs that impersonate airlines or travel brands and route users to attacker-controlled call centers rather than a normal travel document.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://lesfeesdelhetre.fr/upload/files/14171034240.pdf In PDF document text
    • http://hotspot-usa.com/js/upload/files/23458875156.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/5a34baf81165a2fe16d5191a0f3cbbf3/25140587646.pdfIn PDF document text
    • http://darstin.com/userfiles/files/vukigubabebokevib.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/017d34a6300ca59e1829ce806e8782b1/8616664716.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/558b48076e262e42e6ecd71788d19602/13836810007.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/3d8e929b1ae658744b8f6533d50ffe60/87578181594.pdfIn PDF document text
    • http://ozona.pt/wysiwygfiles/file/pesopafalu.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a213879a335---bofixutu.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a84b326fb87---50411327015.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/a5bbefbfc02cd2a1759fdcb203ce056c/zaridexan.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/0c370c0d69f9b61846e605d6fa6d66ce/zuliwo.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160731b3ab686f---53708679238.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/tafejanozud.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/50409811255.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/j2jh9v8il00vbotm5qgub8b914/92867610505.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/tajubejerirakoro.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/xuvakitakedimaxaxeke.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/354c094a9ba5f6fbdf29f9d159cbc61e/5086804552.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/lvsdfrthlufr0esfup4sir8k17/76198552771.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///98986206962.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2a63b9888---69204422327.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/71398472479.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/7107471013.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/97526871201.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/a1ru3ct8ve5ouovj5pme3cq3ea/kiduleguwut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=libro+de+f%C3%ADsica+2+secundaria+2020+pdf+contestadoPDF 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 extracted file (font_00_sfnt_off0006632f.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_00_sfnt_off0006632f.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0006632f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6632F 11068 bytes
SHA-256: a4bf03485eb959ee12b3327a3cf7083f8af1dd2ffef14e1b50042b8572f576bd
font_01_sfnt_off00067cec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67CEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000694fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x694FE 19828 bytes
SHA-256: c881d0695f1d0e4a495cab0ef99f048a81f3ac5ad6a9bc2bafbbbf22baae6552