Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a639fff82e8fbc5…

MALICIOUS

PDF

99.0 KB Created: 2021-07-19 21:27:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9e0fd1fce37c558917b53bff932f1a2e SHA-1: 7886911c8810bb5aaa8b1f1e3b5eee1f507ac187 SHA-256: 4a639fff82e8fbc5c18125bd60bd215f5b6960bfc6b147a9dad504ab03435d0a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that exhibits characteristics of a callback phishing or tech-support scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. It contains numerous links to potentially compromised WordPress upload storage and other disposable hosting sites, suggesting an attempt to host malicious content or redirect users. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities or social engineering to achieve its goals.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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
  • 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.
  • 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://vdavloeren.be/userfiles/files/82243673945.pdf In PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/j6htqu3ndhru1lqg36u20u52l2/81100354404.pdfIn PDF document text
    • http://derma-dts.de/files/file/33018414123.pdfIn PDF document text
    • https://shibbirs.com/media/files/87110062456.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ba9b06e3e---3450611513.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/35423527369.pdfIn PDF document text
    • http://www.nomorcantikspesial.com/file/mesusifopusutiwepibefexir.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/27f0adafbd7ea46644997c89dcb874e4/4652498815.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/bc44dbfe35ff85846e6e455161ae9b5b/24412840112.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/07fd05968494b7e3bba9f520e9be4753/xezawovezovopabivuf.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/zevuv.pdfIn PDF document text
    • https://ivaco.it/file/wupekoves.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/nuvapi.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/caa006fe6a941de8a5b2036d615620a3/saginozuz.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/b2ddc836946ea913f4437a93734e14c0/993247704.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082a54e6dc0d---jurusowesojefujim.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/90184339455.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/51621478922.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607774a3c6db3---wusabaxuribi.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/putigafodugofopuvevite.pdfIn PDF document text
    • https://tavio.ru/files/file/30779276303.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/kepolotow.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/56437940404.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=general+knowledge+questions+and+answers+for+10+year+oldsPDF 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_off00011e34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E34 11280 bytes
SHA-256: 091b1f2f40c9755cbeecab19a31ea609318d9094915c2f9b0026ebec7272a5ab
font_01_sfnt_off00013871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13871 17420 bytes
SHA-256: 7098e793da316e708f2208dd9f75172f1d98f08ca6ed1617ce2ef4ceebd71e25
font_02_sfnt_off00016649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16649 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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