Malicious PDF — malware analysis report

Static analysis result for SHA-256 43baea401bfa0704…

MALICIOUS

PDF

78.2 KB Created: 2021-09-17 14:18:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d39c79ff99b80731de48d5c3ec323dc3 SHA-1: e862aed28dabe44db2cc6def53d94571869be302 SHA-256: 43baea401bfa0704bb4a827f02eda860ad1295c891760d48c822af6b76ecfcce
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple 'PDF_URI' firings strongly suggest this malicious intent. The ClamAV detection and ML classifier further confirm its malicious nature, likely serving as a lure for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://coretry.ru/uplcv?utm_term=app+store+android+gratis PDF link annotation
    • https://rafautama.com/uploads/file/gudufisipuzi.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16135a61a17591---nopelotijudaze.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/kevitobeta.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/57877257076.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fda330e9a4---kanorusowigezo.pdfIn PDF document text
    • http://tornyanggrace.com/upload/file/34518811513.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/23206244012.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/ginurirojizotatemid.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/nadekuferosadafif.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/pelexevinegugo.pdfIn PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/33650652613.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/jatetusazomosowubuta.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/ripizerogoxub.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/81169461977.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/70959472384.pdfIn PDF document text
    • https://matricula.arendic.cl/files/30092860535.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/43293496462.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/cbbb0d8fcce5c5c903eb5dcc63763d6b/zasodabemubejozoxezuraji.pdfIn PDF document text
    • http://dptech.vn/uploads/files/nozomewiposibes.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebaf2e396e---konuxidadefusafunozon.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/70066165464.pdfIn PDF document text
    • https://rosanaalvarracin.com/userfiles/file/wipevolasulidutog.pdfIn PDF document text
    • http://cy2hand.com/userfiles/73034196239.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/vifazoga.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/fagepoxemes.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ab36be4aa---32087669022.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_off0000cd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD16 17664 bytes
SHA-256: 8844d76f800788c1ea3cee5231270f2042223e6cdbeb82b4977ee7a1de9c4169
font_01_sfnt_off0000fb16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB16 10504 bytes
SHA-256: 8ce3293dfe1285efa6bc769377440fa441eb8ee33d85de84d3db5714af13f9f3
font_02_sfnt_off000112e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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