Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab855b4d559a6d5d…

MALICIOUS

PDF

80.9 KB Created: 2021-09-04 04:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 73da0f57e50fc6c7d3e85c1ec6de7d49 SHA-1: 602f5623903954e5cf9d467f92eb4d1527f1731c SHA-256: ab855b4d559a6d5d0b9cf878e64cc8bfb64e06040fbcbaed3d94daec0d9e34ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing sites or download further malware. The file's structure and URL patterns are consistent with a link farm designed for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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://benedictinoselrosal.org/ckfinder/userfiles/files/jorafekigakuxonesopalosap.pdf In PDF document text
    • http://martonaroniskola.net/userfiles/file/tumakulilunivumolupi.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/40873798450.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/33da55ae02496cd24b1c5ecf0a2cf031/53044101775.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/16551025224.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/06/20/62568387577.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/67113035620.pdfIn PDF document text
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/kikekovine.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp//files/moxefedubezigada.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/fevumo.pdfIn PDF document text
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/54b2baae9d15dffdb5aa4aa5ff57e4a3/riborepotatabe.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/m7suvcloe50fioul6dovu1r3co/24332098545.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/45537024928.pdfIn PDF document text
    • http://ccshecea.org/upload/files/guroparufikibatabav.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/28667287673.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077f3f08305c---fajivajikozuvajeni.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1608f36d433318---jovedojar.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37594915811.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160886d4f61a8b---98675001241.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610eae05a207f---tagakizasuriverarubazise.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/utal3c3i1sqofma360rgl5u1p2/47451893353.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d8b6532dc5f---71044141438.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/zezekokizifewufirulem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=cara+mengubah+word+ke+pdf+pada+laptopPDF 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_off0000d6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF1 17668 bytes
SHA-256: 1dbd45afe7380f77252540183f6325d71bf3b1305958f0a874062fc36966534c
font_02_sfnt_off00011c9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9A 11136 bytes
SHA-256: 15512190788f965402268d6c9f539d08754c2862cc087f34dfa95df93559cb86

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