Malicious PDF — malware analysis report

Static analysis result for SHA-256 26a690ae8fa594e9…

MALICIOUS

PDF

82.0 KB Created: 2021-08-22 01:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: db9d8306ce8fc45a24081f652d86e50b SHA-1: 2c8e4961dac45dda8b9377bd5b810d2ecf9f3f8c SHA-256: 26a690ae8fa594e9678d7fc4de0733b211f85111b9227597f9b5b95308a87f9a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically indicating phishing and trojan activity. It contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, suggesting an attempt to distribute malicious content or phish for credentials. The presence of external URIs and link farm characteristics strongly indicates a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://garglob.ru/uplcv?utm_term=how+to+bypass+lube+belt+on+horizon+treadmill
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b81443f1cd---xatutewawo.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/cca39701c4684c435c2e49d9d5463438/85110102615.pdf
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/wutonibafigerefusida.pdf
    • http://ezibra.pl/upload//file/36189115024.pdf
    • https://lockerova.eu/admin/upload/documents/40964138527.pdf
    • http://kaitosushisb.com/uploads/files/28988179211.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a29848b63cfd934a7c298b30ff0adc57/xotubip.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/7860bc5c76837696235acb66129f1acd/xibazinapigunage.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bea9da2cda0---16347635862.pdf
    • https://infrastone.com/userfiles/files/xewebinomurufubuwo.pdf
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/12064374110.pdf
    • http://jshtextile.com/UserFiles/file///mekumolejudifu.pdf
    • https://ka-base.no/images_students/files/86042178014.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755b67095a1---51931817053.pdf
    • https://economiadecomunion.net/ckfinder/userfiles/files/44489902183.pdf
    • http://jinistudy.com/_UploadFile/Images/file/71617319698.pdf
    • https://cualuoihoanmy.com/uploads/userfiles/file/futoweligutowijizatab.pdf
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/11459779535.pdf
    • https://classconnbio.com/img-jacson/files/nagobosugin.pdf
    • https://abrasco.org.br/ckfinder/userfiles/files/boxafawokofutikireb.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/e50d4d8511983d17f6b3fe814d867cdc/gosutiponumojugego.pdf
    • http://am-assets.com/aom/magnolia/userfiles/file/bifexabuxaradurejujabe.pdf
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/2021816021299023.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df2a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2A 16792 bytes
font_01_sfnt_off0000f73c.bin
a4f27d1d02c931971fc138d968ebb6f65e1ac0119e3a8fab2d1c0579ecd16d68
pdf-font-stream PDF embedded font (sfnt) at offset 0xF73C 15612 bytes
font_02_sfnt_off00011f37.bin
ae5688bdcec4b3f73cd9ab87e15a99c421023b278dfc9f27d7891584970ab9ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F37 11148 bytes