Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba742965d4c72634…

MALICIOUS

PDF

94.5 KB Created: 2021-07-07 01:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: ac8b01664bd4990104e2dec8e0f44cba SHA-1: c534fb5cf3574a3988bd24ef79fa941a38ce8bf9 SHA-256: ba742965d4c726340a3d615dcb4511b9b36f84986c3738ec1d2d243bbeda97d8
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, suggesting it may be part of a larger phishing infrastructure. The ML classifier and ClamAV detection further support its malicious nature, flagging it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/aece38ae26248add3a9b5f12247cf07a/79588394707.pdf In PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/j7i0f8mm7hgdgsd3pv7gbs9096/16156712942.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/wezikozat.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/a246701d70e8739aab24964bd150bec3/433438865.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/57669028546.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/a6a3c8f8a1a4c5091008f6eb2d963fc4/59190216088.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/vixavukikud.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/18585167281.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/61465471130.pdfIn PDF document text
    • http://runo34.ru/attachments/file/zamazutot.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/5e335c6721fe5424afc0a74c266879e2/37465231897.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/4eifh8rn13ms12b9ad45opup52/rakusejipeporovilafe.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/vuripajojozafeletimazox.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160db2ba83f473---bezirefowoxusumofiwu.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/d042e0d45f80b66b6b56381921ce5a4b/56340435301.pdfIn PDF document text
    • https://crpm.ch/ck/ckfinder/userfiles/files/39526525092.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/todavopefijadik.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/vutalusuxilumezewurewumak.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/ci7ak9465k59bci1irvlql7bi7/mawekopijemudaxatutase.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160756143543a4---suwolovapabatatarafivoka.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/b5cd10016d65df9696ff5f9ee63a28b6/nuxawuvofemuzejajujis.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/pajamozoritel.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/58870825680.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609009eb722b5---32515857998.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=sore+dew+clawPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0E 10060 bytes
SHA-256: 2bba4170e93f15f6aa1f522b8a97862b02616b55e3428869bc832f65195b1e25
font_01_sfnt_off0001139d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139D 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_02_sfnt_off00012915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12915 16788 bytes
SHA-256: ead18ca7142a432cec0f83319b780625f683e4d8e7a64cde7c416e074e6de7ab
font_03_sfnt_off00015494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15494 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1