Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cbd89c994b64e12…

MALICIOUS

PDF

87.0 KB Created: 2021-09-13 03:38:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 436046f1179fbf02f0bc4b92f4edc2ad SHA-1: 1ed47b4ffccf7faf9210cda885b55bb3ad179355 SHA-256: 0cbd89c994b64e123b226f1ce936a09275147792a93eebf177c64e421ae1bc47
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple compromised CMS upload links further supports the malicious intent.

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 http://dezmaster.com/userfiles/file/5502974665.pdf In PDF document text
    • https://khambenhxahoi115.com/images/files/31774288918.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210903/file/koduwise.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/wexewilewapiridu.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/78929756034.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/zisuropebiwugelemupa.pdfIn PDF document text
    • http://tongshengchem.com/ckfinder/userfiles/files/xowikom.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/kebiviwenovej.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16134dd2b2f2bd---15585967762.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/56495429905.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/posez.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/rexalininalobimupovagi.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/23648870604.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/70353981382.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/woxanirosuwidefa.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/zesexelanonuluwoj.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/911bde6e2d786e349a8089229406339e/59198096150.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/nemuva.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a43ac02af---1105968855.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/7373457474.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/taxiwamegudit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=harry+potter+and+the+deathly+hallows+online+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF202 16632 bytes
SHA-256: e896d0c9c6509c93731645541c0836c845742b74f7fde2e8ff5e94baacc6a6a0
font_02_sfnt_off0001098f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098F 16972 bytes
SHA-256: 77e3997ba5a7ef68865b1ae256604dd55060018df6066e8f2265b43d77ffe6e9
font_03_sfnt_off00013567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13567 10788 bytes
SHA-256: 70910c1866f4055578a9e866415c73bd55fa61fe99cf6ca248697362a9e5a214

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