Malicious PDF — malware analysis report

Static analysis result for SHA-256 73e9c77584dae7de…

MALICIOUS

PDF

77.5 KB Created: 2021-09-05 08:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4edd1c542a0535e6afe8beb83d285b6f SHA-1: b4a49affd059b6778caf81e00fda086864cc9ed9 SHA-256: 73e9c77584dae7dedbbe522391bb7e155ccb15f94e38d2a386bcfd9bf268ecd2
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs, some pointing to compromised CMS upload storage and disposable hosting, indicating a malicious intent to host or link to malicious content. The 'SE_CALLBACK_LURE' heuristic strongly suggests the document is designed to trick the user into calling a fraudulent phone number, likely for a tech-support scam or a similar phishing scheme. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kimyasaldubeller.com/upload/ckfinder/files/punasarepidimov.pdf In PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/d8o0i6p1g0hsho2of4fkb683s0/59902863661.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///58613437528.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/bewepop.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/dobegowotarifokixet.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/pusuvajusaguvabes.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/17624963475.pdfIn PDF document text
    • http://mousike.it/img_ins/files/temuvise.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/pilimimelaputovajowamaxim.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/7372973584.pdfIn PDF document text
    • http://nsureunion.com/clients/71556/File/lawaje.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/zejexotutexewasem.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/365388927.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942ba7dacc3---woredarut.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/gejifotile.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/49083090142.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/faxepafudojikezuforesaza.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/64c65b2408b43aeb82ed9eccd1d82302/morujodupawiwusekuxiw.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/4a7184056ea07ba4eab6f50f009e6ab5/waxofidojenumodesiruzebu.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/58404708961.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c30a32b2c38---7429808832.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/gisifakosa.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/gimovorobe.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/lozot.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/41372381755.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=valoracion+fisica+de+la+embarazada+pdfPDF 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_off0000c7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E5 18312 bytes
SHA-256: 9bf8b19577bce7573eeca1934b7698a06fabdfd0f6efda657ec65795ef018cfd
font_01_sfnt_off0000f5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBF 10852 bytes
SHA-256: 0ece1d4500ec0ba38f02057cfe920e0024c36b65f5500fbdc2b389e9213b2ee1

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