Malicious PDF — malware analysis report

Static analysis result for SHA-256 34c1068283ef3f33…

MALICIOUS

PDF

97.1 KB Created: 2021-10-06 15:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 50a85ff62eb4c98adc5025d043c8cfdd SHA-1: cd372b30d0520c2afe034158df3d7280b4ff3b04 SHA-256: 34c1068283ef3f33490edfdb8d54dc3afd140327cbe49af374563f9e2ff1b47d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains an embedded JavaScript stream and numerous URLs, many of which point to potentially compromised or disposable domains hosting other PDF files. The ML classifier also strongly indicated maliciousness. The presence of JavaScript suggests an attempt to execute code within the PDF viewer, likely to facilitate the download or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://alquimia.in/admin/fckeditor/editorfile/13578778187.pdf In PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161597e9db35ab---26345889231.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161584dc09f97d---30574722211.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/3105595299.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/ed16d1c1269d855918f264cdfbf65b01/72717724070.pdfIn PDF document text
    • https://alummaswaja.com/yii/sdbalikpapan/home/images/upload/files/kazegedijigi.pdfIn PDF document text
    • http://rc-modeller.se/images/file///fegekibixip.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/nebijonasodo.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/xijunijuxozeneberemevidoz.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/marobo.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/20787882302.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/pikusi.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614add760fae8---kaxututokawuwedoxazegivu.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/21052640130.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/22965941582.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210922010014.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/57108237616.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/161531c2c7fd11---70822139297.pdfIn PDF document text
    • https://trainova.com/userfiles/file/tagagefusikivizikusukujir.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/67855732092.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/jujidesubipeset.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/menuzeziv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=pear+and+fig+galettePDF link annotation
    • https://grupo.iberia.com/js/ckfinder/userfiles/files/muzabodejupaganenojefor.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_off000110e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E0 21344 bytes
SHA-256: 52f0d7bbada5d504e4855083c62a9775ba269bbc8f65a92e7e439e48138809d0
font_01_sfnt_off0001477d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1477D 10240 bytes
SHA-256: 7d3370a1b2a869b5797e77e95b2829b6f4b027597d8104ecadeab7720a800f89
font_02_sfnt_off00015e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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