Malicious PDF — malware analysis report

Static analysis result for SHA-256 227f3511f640f1a0…

MALICIOUS

PDF

75.9 KB Created: 2021-09-13 11:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 52ff46699bb6388e42908932fd2dd7e4 SHA-1: b3f7745b4875165d06d51b8b86e0790da7e1d84f SHA-256: 227f3511f640f1a06c8f976da999f016daca0021aab949a7459f9e544a868cbf
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristic firings and URL analysis clearly point to a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://catamma.ru/uplcv?utm_term=character+study+of+timothy+pdf PDF link annotation
    • http://joyandwowbook.com/upload/file/bomuwagus.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/jujoxudajorud.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/f516687dd8342b93ea15d08b39e09874/93525378823.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/63369081485.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/xadudirojovez.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/495442a67a26752bec09f32125dcddcf/tapiketotupow.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/24506253280.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/vixamuwadetana.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/46929264840.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/25277fc0fa7eab13f865388b5eb4006c/bokazinepelunuzugujago.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/90619958184.pdfIn PDF document text
    • http://sandlnae.com/data/editor/file/bopevajag.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/1d10a41bcce6aa31319a003c24b26863/zavatajawezak.pdfIn PDF document text
    • http://newmob.it/userfiles/files/67104932657.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/74063047387.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139938591547---nowexafuzawifutaj.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/f4860440556131b0aa54dde7ff248bd4/mejafewokuwazumito.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/8710773901.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210903205856_t60hk1.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/wisupirojivosewa.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/kexufivofunap.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/r21jr6s0gvhu4521f98bee826k/24021815746.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/90915561738.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/25930071809.pdfIn PDF document text
    • 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_off0000c2a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A0 10980 bytes
SHA-256: 89fb471ea415f2ef7a4161b0f67be450011c53b23d5df6c3472ecdc7aed5b54a
font_01_sfnt_off0000dc30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC30 17632 bytes
SHA-256: b44ed60f50935d9bb402a16140beadc6e2febf4bbbbdffeb286c3f6ed936a50b
font_02_sfnt_off0001099f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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