Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef41039e7771c9ce…

MALICIOUS

PDF

117.6 KB Created: 2021-08-03 15:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 33e4054aaa7a1ea41eb3a3f78bf82d0c SHA-1: c1911f8eb8dbac684fe0930bd79ece751c36f27b SHA-256: ef41039e7771c9ce99c8d697f6db8542be7b2a98afed8a89527455065536d670
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised websites and disposable hosting. These links likely lead to further malicious content or phishing attempts, suggesting a multi-stage attack. The PDF structure itself is designed to obscure its malicious intent by presenting a large number of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://laborke.ru/uplcv?utm_term=what+are+the+attributes+of+the+holy+spirit%27s+personhood PDF link annotation
    • http://all-pass.com/folder/editor/file/jejikikapewiganux.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/73998636527.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/2a7d44d1db50bdfcccd1518480eab3ed/jikop.pdfIn PDF document text
    • http://poorclarescork.ie/images/74083994637.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/besibuvaruzenixajubigu.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/52348342683.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/4e609c2461b4e40a907371254bde5be6/wavigabob.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/km62hfje5oj3v807led75h0u65/dadiduxujinigija.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b90b2c90715---14041071531.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/87db998cc1561ac6bdb335639da17016/bipakegowukesilowelopon.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/1af446a44a3ace990066b10cbf1f6ffd/daloga.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608976288a140---42893471398.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/ff6ef9435665c29b1c08e171fe58213c/pobedinoxepajumatasifi.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/74170958483.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/8bm9t0s3m23dc1cheuhi2rd7n8/jinasetiwebes.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/48314475177.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/71568938044.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/84144e99dcd3ba604bb9ed27c950f642/88775077268.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/nizokewizamowenebure.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/a1c396c5f8b12e73836d5a43bb092aac/mumaxejarosesozided.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/3ac9086c71381e44b3c337869a04bd37/56948998130.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/42949398194.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160bad9bc9b2cb---32964905641.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/53656039206.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16080b5dee0bab---54069502200.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16246 10976 bytes
SHA-256: 03b42678d29803965101e96bf348ea36db92691e3d9aba52b526b9df4a001fe9
font_02_sfnt_off00017b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B81 16352 bytes
SHA-256: 4aedc4092ade7118902107218900d217dae62b147e771f3f96b1d87d03b5c9d0
font_03_sfnt_off000191df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191DF 19860 bytes
SHA-256: b13aeff469bf9a31999e870a2943d7f4039013f9eda14b865c45195b522ca92f

Open this report in the interactive analyzer, or submit your own file for analysis.