Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bc71ef02eee120a…

MALICIOUS

PDF

77.7 KB Created: 2021-09-06 11:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b7b295fca416cc769bfe7a055dfc760d SHA-1: 2bc85a9f89782aa7b20eb2eead45f58c1b49b043 SHA-256: 4bc71ef02eee120a0c5489399994efa1a41dd07218b022f40cc1ed7a20aaf3aa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a primary mechanism for executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://dveropolis.ru/upload_picture/womilivefibuboxatowonuxi.pdf In PDF document text
    • http://lesen-und-schenken.de/userfiles/files/gamapisigajigujepi.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/88ae25d3e072562bbeeb9fe99f3a7999/serepivirokuzuti.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bdaa354cfd1---wezesaxivad.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6918d155e---59711687625.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/mivatak.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/f78a54c85d59fe333d8613634f184116/zibogu.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160e37080572c3---fukit.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c628d0709a---87824079754.pdfIn PDF document text
    • http://mastersequipments.com/ckfinder/userfiles/files/61984378645.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202108231710248133.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/jegij.pdfIn PDF document text
    • http://fittbikese.hu/files/file/74107821462.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/80713677e1cd2d7245ab54f4ca1ca7c2/zakepikikawukotoworasodow.pdfIn PDF document text
    • http://simonide.org/userfiles/file/95068355463.pdfIn PDF document text
    • https://gangnampools.com/contents/files/4385392036.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/91536460323.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/kazakuredetovo.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/884efab8285e51a366538858d68a132d/82978256717.pdfIn PDF document text
    • http://willismctyeire.com/clients/c/cd/cd1fd5262213d36872a77bd42df049b7/File/fixasa.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/43633454747.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838c559b8ac---sejorisavubivunole.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210509114607200.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/fifexapuziwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=action+and+helping+verbs+worksheetPDF 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_off0000cadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCADD 11156 bytes
SHA-256: eeb70d49fabc9c710309f6b3a98e72ba70005e36f60a340b659669931e71e93e
font_01_sfnt_off0000e485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE485 17268 bytes
SHA-256: 25ecbddf083f15cf0c9dcd2397b261e061d76a1df9cbc039752ed84f2867c2a1
font_02_sfnt_off00011136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11136 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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