Malicious PDF — malware analysis report

Static analysis result for SHA-256 72a0aa5cf0c9bf93…

MALICIOUS

PDF

66.1 KB Created: 2021-05-26 23:28:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: d5ce1f8c399e66816bd294d107999551 SHA-1: 047005fcf71761fc7d7d11fa0b9cfd46350f76d4 SHA-256: 72a0aa5cf0c9bf93444308958dc537a909373d172ae14d176da1fdab665136b4
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript, though not fully detailed, further supports the likelihood of malicious activity, such as downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://inwebjor.ru/uplcv?utm_term=mobil+polyrex+em+grease+cross+reference PDF link annotation
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a80a388904e---23576161814.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/e38f0aa5fccedc009673a842951523b2/niwizixukavowafo.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/11492746247.pdfIn PDF document text
    • http://aimic.com/userfiles/file/75326248910.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/277bbffa8e07cc5a1a35ed71fdd68161/fapudowifakutewatatubowux.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca55cd9614---11950042708.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/33612910795.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/vumodinukiwixiwararinaxil.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/wosudutexovenawe.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d323529ba2---51373906673.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607876f6825c5---39132470758.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/q8cvsbbl8bo1gp2uhhmna15mvo/37533723675.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/bl3aajs2ned2k45t46ofmqlsmk/wufasigorajukegowuzojigot.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210527041735678.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc1a0e7463---xesegofezubi.pdfIn PDF document text
    • http://yuha.be/_files/file/jarotinafukipaxaneg.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_off0000c77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC77C 5652 bytes
SHA-256: 338fdc870aa0ab78ddf98ee446a9548440b4ebdc01c8081011b4c9f504c103c8
font_01_sfnt_off0000daba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABA 9580 bytes
SHA-256: f89adadfb78fb74e327549946ada51c4fdf226d58d264a9e49a69f016f59bc4b

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