Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecefb1ac138d9f42…

MALICIOUS

PDF

70.5 KB Created: 2021-06-22 15:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 840f9b3081d291b69cb880c8aa85e6e9 SHA-1: dd62dce200acbfb31db6828552d7284251edc11f SHA-256: ecefb1ac138d9f423f3ba2a4e5c7b036e7dd0ee0eae1d4994bef03ed3baa3c8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, detecting it as Pdf.Phishing.Trojan. Multiple heuristics indicate it functions as a link farm, directing users to various compromised WordPress upload directories and other disposable hosting sites. The embedded URLs, such as 'https://allytemp.ru/uplcv?utm_term=circuit+breaker+maintenance+manual', are likely used to deliver phishing content or further malware stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://allytemp.ru/uplcv?utm_term=circuit+breaker+maintenance+manual PDF link annotation
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/on579b4c1tj0rv7smh6lgmda7n/silajotakupojuluvavobarel.pdfIn PDF document text
    • http://calisnt.com/uploads/files/1698174042.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a20d2cd8b22---wofenipugikimolutokabi.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/laxitukazapifine.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/39ca19d0bbb8efe06d764f3410b0fecc/pawupi.pdfIn PDF document text
    • http://ezibra.pl/upload//file/keseduso.pdfIn PDF document text
    • https://iwistw.com/upload/files/zimogenafazavodinu.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/4dqi67m1l7btr2l0tvh68e0p16/goxategiwuwawid.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16070fe00edb04---felivelibesavotasa.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/vakarunugamiwarig.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a97c3119f5d---73062787331.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/fejozawesibenekunu.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160cc25876d48a---metatupugi.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/f371f498fb48f5ed91ef5226270b4823/jepuj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BD 4876 bytes
SHA-256: 8aa1d1fbf8ba322833caa2f97f865539aa64023f3e5f2e2a345fe08904a7d7d5
font_01_sfnt_off0000e940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE940 10480 bytes
SHA-256: a90dd3c57a4ade345ce1a71275568edd63b8175d779df5f7adcbc2e454905fe4

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