Malicious PDF — malware analysis report

Static analysis result for SHA-256 baf420c5dda95375…

MALICIOUS

PDF

84.1 KB Created: 2021-07-23 03:32:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 26578c818fa4501590b9931af1a4d5c1 SHA-1: ad2ead44731902f5c4b883857eeb49cac11225dd SHA-256: baf420c5dda95375c04b0d97089ac0db923b6549f11efb720f62fea9bee40d8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to compromised WordPress sites and other domains hosting PDF files. This behavior is indicative of a link farm, likely used to manipulate search engine results or to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://areicon.com/images/file/paxiwisifu.pdf In PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6145f01da---kadogineredo.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/ba46a66faaec108b27cdae0d4ae4e11a/moraxonilofesabepikezano.pdfIn PDF document text
    • http://reikihaus.com/clients/75291/File/fofekifimawoxola.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/kbt4e74shf7p51r8jhr9s26c44/busexegijuwo.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7e41fe6b22702704f8343c472e5724e3/tiroriwitavizuzuw.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d84c6ef62---dobobemizi.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210502165820650.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/60385856639.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ef9f8fd4e---68020632076.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160d958fc67513---zulufobivuvadavoj.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/3q5kmftqi6ov271frt1p6vat0f/situritilozar.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/judagu.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f2e59a1de---6559241905.pdfIn PDF document text
    • https://rintrans.com/files/dobasajekapiwakulewutevam.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/58530514402.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/a02d491411a54431c601b0cc46947a18/tetemodeli.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160e2732cad866---pobexorujozabebolus.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fa3db3ac6---58137972883.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e91577ad368---momisasunuxola.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608f288495036---86370101825.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/filabupo.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f199a5251f---bepezusureleri.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/0275faedf96d87f7bf8d7edb769e210f/97536540206.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/6e237d98ea1a7148539b64f0e1c012dc/29481040340.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b8fdf064435---zevedaneramapafedixezipen.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca157199b2---vasadefaxeramofewiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=festival+meaning+in+englishPDF 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_off0000e464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE464 10380 bytes
SHA-256: 7695fa8eaf5bed17a20ef6d802b40d41a01d7840892a37a70b032db3552c9815
font_01_sfnt_off0000fba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B6 18436 bytes
SHA-256: f6e68840126b1818bbeb0ff46495514e3e022134ea2211520cfdfc7b4ecb38e2

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