Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a1fa4970478f773…

MALICIOUS

PDF

83.7 KB Created: 2021-06-29 11:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3cd4accd0fbb0faedcdce1dfb06fceaf SHA-1: fe31a87d7e51405ae49d400782ad1a08d0b0fbab SHA-256: 7a1fa4970478f773bc5eef5a39d0f7e1938723002f1d43ae4ed08916b8fc12c0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of numerous external URIs and the nature of the hosting indicate a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

Heuristics 6

  • 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.
  • 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://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/3ab25897614c58899faa9c1d8b77ab87/98547178691.pdf In PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/46529337362.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/1bc598b39c32402615f592172d0c83a5/63277322256.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/80498196306.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/37874854017.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/b3111a602fe6d969195cb74e534c4aff/zimuvevi.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/a093e0daa04a018ac1a63cd4f9abc7ac/zejogogadutuluxepover.pdfIn PDF document text
    • https://fallsplat.se/file/vexerobasajakopowowe.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/fc64f3e3b3e2c3b67cdfd6d8546d7baa/jakugavodeb.pdfIn PDF document text
    • http://labonguyenhoang.com/img-chamthi/files/razipeki.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/88400422426.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/5d88fa1aba9edecd3e54eca2db1c26ca/33450428694.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b8cd0d0020d---71628872131.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/qkmopc54ms1s34339idla64np4/povujegekumusutejulux.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/39bf222ea44bdef709e8173a5662aaaf/15825502144.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/12728980980.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bf11414ac70---6559274834.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/68366503182.pdfIn PDF document text
    • http://resheto.ru/users_images//fck/file/jipasoribemubi.pdfIn PDF document text
    • http://componentcnc.hu/uploads/ckfinder/userfiles/files/49893145920.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/e6a6f4ea340c50d65814cc829b8788e7/makilogagegibituganig.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d5f2c1e3e---43511465915.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/16106386966.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=12th+chemistry+practical+book+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB62 17208 bytes
SHA-256: ef2300902a2eaf5964cce6ddedb373eb3a6b6aea928e382f16fddd42db87de7f
font_01_sfnt_off0000f8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AB 11200 bytes
SHA-256: 9ff655dfee18ed3667ee37e8d4a9b4b7785a355b5aff3a8ae1d79068bce95b2f
font_02_sfnt_off000112be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BE 16252 bytes
SHA-256: 1b8db45e7ce78afa1a930e4adc7d2cc3d98092d808e7cdf3049bd86f2cb86cbf
font_03_sfnt_off000128bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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