Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f2583f2e6aebdd2…

MALICIOUS

PDF

114.8 KB Created: 2021-07-14 07:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b5664e706934ffef3b00a0eca853864e SHA-1: 2643b55d5f1fffd00038a8d07e312d11ed104bd5 SHA-256: 3f2583f2e6aebdd2b27ad25634644450389976fe4a12bd521e681c25d42379fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, suggesting it is used to redirect users to phishing pages or download further malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://medvor.ru/uplcv?utm_term=acknowledgement+of+english+literature+project PDF link annotation
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/mbp3a8lt70o0ksqh7f4ndctglv/xalatupegek.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160abb5cd6288c---22442917871.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/1ea2f375905e10b496ea7fb704a61987/47024697247.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086565948de0---760594961.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/3e539a820038e4f3321743ac0dee0707/gisomofupifujakareta.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/jizavupovituvafesibiwuluv.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec66223c3e---nugokupojifakajunufukap.pdfIn PDF document text
    • http://abnicum.com/files/file/72548970293.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/85432764703.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/zegigepexutinoranev.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/15607521051.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/53544143901.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/zelufobizeleke.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca208e4430---48360491157.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/34159084660.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/65142286887.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/9a5e7b65dc49248ce40898852f2b7d8a/63595824956.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607017f0c12f0---nebaw.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/86827224837.pdfIn PDF document text
    • https://nenanhduong.vn/Upload/files/77016278821.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd88a6cd63---2848360018.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/8stkqk8eucls8euhhndnjq02h7/tagujokizowikifujaka.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/paxolusipabujul.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/20244805673.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_off00015932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15932 18448 bytes
SHA-256: fb0f202b8ab888958c94dbb151ea2a5fe2f74e5656532173f3651e462156c1f6
font_01_sfnt_off0001892e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1892E 11456 bytes
SHA-256: 9414df3d45d7686fed077c089239c490c521e636d27b18fb0076ae2fb3dacd23
font_02_sfnt_off0001a3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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