Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fb2839cebc96f7c…

MALICIOUS

PDF

92.1 KB Created: 2021-09-20 18:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7c2844f87ef2c812b91f7c8035a99569 SHA-1: 8f334f7afb09de7196342abda066a0f1e11befca SHA-256: 1fb2839cebc96f7c170da2bfd864e77c4c808158af4b5ba4018a2edfe5dac0fc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. It also functions as a link farm, directing users to multiple external PDF files hosted on various domains, some of which appear to be compromised WordPress sites. This suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://amphorabeautyclub.com/campannas/file/26983307132.pdf In PDF document text
    • https://portoggitter.no/content/files/userfiles/file///roketazopedujexip.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/74638122512.pdfIn PDF document text
    • http://home-plast.ru/foto/files/newokosiluwo.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6c3d1d2e5---notozavexituluzovusarap.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/xilupulibajiguvurofuf.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/pujojin.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/161420444c1893---93905639515.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/mqa3h6eg8tc482d4g7l47a9pr2/24708366229.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/fisejewafimewidadovetakex.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/32551996291.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/74415429293.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1ab20dd5e5ce74b505012ac3e49935f5/fesonapozixa.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/fodovesorizagivofeje.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/96876352679.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/17452467192.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/13622833635.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/65173459266.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/65545019479.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/82768511719.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/toxasefexelubapel.pdfIn PDF document text
    • http://hasomedia.com/userfiles/file/36162569825.pdfIn PDF document text
    • http://tecksco.com/upload/files/7502338669.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/33366418880.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=geno+sans+wikiPDF 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_off00010286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10286 19012 bytes
SHA-256: c44e43152527247a3ff0f7af76e7f61379c917c1a985ad5959122d6783f969d3
font_01_sfnt_off0001345f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1345F 10072 bytes
SHA-256: 64a439577f493b73aa58327a9fb64cf5005d22113e398c2de2ea361a90616716
font_02_sfnt_off00014b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1