Malicious PDF — malware analysis report

Static analysis result for SHA-256 29fb831eb1291dfc…

MALICIOUS

PDF

107.2 KB Created: 2021-06-26 09:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5453a4017f99e7936c2baaa56821a2b0 SHA-1: 58fc28e21025c29b0239127096a56be9291f3b83 SHA-256: 29fb831eb1291dfc3c7d90d6f9700bfe6f38772dfbd5bd84049f5f5ebd809e88
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS upload storage locations, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, so the primary attack vector appears to be the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://bagumul.com/file_upload/spaw_upload/file/20210507224920.pdf In PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/eeh18tq10lrroqpml4haph2lla/6414289442.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/lekujowojowa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8397001ad---36783115598.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/iho6ai8k6l28u0j4gjdr71cju2/gesajopomoxa.pdfIn PDF document text
    • http://fitviewer.biz/files/file/38442689540.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/70594957261.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/jenobuzananasokakojud.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9e7e7f9af---jowanad.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/v3d89voc3fg55g597psq5bork1/78781645972.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/toxajuxewulenagumupobeved.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/6e535d5fc41865c0cedf32a231a6a388/23799450665.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d1e2e5706---fogan.pdfIn PDF document text
    • https://luminex.pl/upload/file/relimulisivawutukoxikigow.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/gimidujogir.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/zedawovuxesefowugib.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/gumisotajufuj.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c26476de095---79543412506.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210608075039404.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210503213159727.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/vufurufoniko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=special+characters+alphabetical+orderPDF 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_off0000f5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CB 41736 bytes
SHA-256: d2e50655807d1849ea4f05c1e040f16a7d512e3dd5fbf47767bc67d17573fc47
font_01_sfnt_off0001539a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1539A 17796 bytes
SHA-256: 25ff32def90bfaca9eee76e119a8ebcf37c2e1a843396e088b11d580a7f35b2f
font_02_sfnt_off00016ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000186d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186D4 10724 bytes
SHA-256: 4fd3de2fa76eb92282d0faf686384be7a4964804e35e3261404e116a4bc75bb4

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