Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef5383967b42e75a…

MALICIOUS

PDF

84.0 KB Created: 2021-09-20 17:03:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3c52464129c16e5cdf7c448b09fc03df SHA-1: 1f18230f59c88216e9a05232b07857461c96e1b8 SHA-256: ef5383967b42e75ac217698ec370bbc5f2885c35e441782b2c9450b1215d3751
156 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 CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pistant.ru/uplcv?utm_term=inshot+video+downloader+apk
    • https://codecs.ro/images/file/xadowasisuk.pdf
    • http://lncxjzxxw.com/upload_fck/file/2021-9-14/20210914170801560142.pdf
    • https://accuratesearch.com/userfiles/file/togotovisurarem.pdf
    • https://rajatotogroup1.com/contents/files/61145764838.pdf
    • https://cincia.ro/ckfinder/userfiles/files/70343875800.pdf
    • http://vitacanes.com/uploads/files/fapebasixapaxerigureveguj.pdf
    • http://carsonpokebar.com/uploads/files/63158146795.pdf
    • http://sbriz.ru/userfiles/file/dimotivebodomux.pdf
    • http://geonatlife.es/ckfinder/userfiles/files/10289397034.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/08441a72d3ef6b008552c72bc8ed2cc8/89077978113.pdf
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/92865016861.pdf
    • http://studiogeologicotrilobite.com/userfiles/files/41794067537.pdf
    • https://esofagopisa.it/userfiles/file/45464582457.pdf
    • https://twr1115.net/files/fckeditor/file/fafenejugerebutipenegiz.pdf
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/94031080702.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/9e19d30c05c06d2fa443e61d66e0572c/wewenuxiwox.pdf
    • http://polyacer-ecp.com/userfiles/files/20210912_210213.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f65b6bdbb3---vogabozaxeluruvavukuj.pdf
    • https://namhunglogistic.vn/site/files/10718980070.pdf
    • http://ottotech.center/userfiles/file/pasexep.pdf
    • http://modamoda.nl/uploads/pic_lib/file/kuwojixutiragofulev.pdf
    • https://pgprojekt.pl/Upload/file/22148294614.pdf
    • https://perfecthospital.org/FCKeditor/file/vikeruzamujewizunakad.pdf
    • http://wtmongolia.com/materials/file/7555202252.pdf
    • http://lhdrum.com/User_File/UpFile/file/20210904051721_MTE1NzU2NDcyMTk=.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_off0000e2d6.bin
12d945b90c69db53535cc789f02e0ddf2b2b093247e532eb0025718a609dbf9f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D6 10684 bytes
font_01_sfnt_off0000fb52.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB52 16792 bytes
font_02_sfnt_off00011364.bin
fc28cd7289414fe59d09b4fedb8e80b0161d9bc9c8b73218a4b95d3a73b958aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x11364 18052 bytes