Malicious PDF — malware analysis report

Static analysis result for SHA-256 48fd41351f53ac16…

MALICIOUS

PDF

80.4 KB Created: 2021-09-20 00:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9e09da8b89e6c619d6e61256e68be1e9 SHA-1: 8394ce654a47a9a41deda93e134b35d17cbee836 SHA-256: 48fd41351f53ac164bfeb2f9c0fe474d2a174f77e21b9ec7646c9506f0e0f859
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on different hosts, suggesting an attempt to distribute malicious content or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=view+pc+files+on+android PDF link annotation
    • https://bjjewels.net/nbloom/fckuploads/file/fupifopibapokuduragog.pdfIn PDF document text
    • http://kisito.com/userfiles/file/texogusazak.pdfIn PDF document text
    • http://mobiliteit.nu/files/woviramepap.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/19688760110.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/3fe2d4c042fecbf6cf0081e590028299/15817465161.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/70756215713.pdfIn PDF document text
    • http://ud2-140.com/files/52224033433.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/pujebarifuvosujugus.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/84843158234.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147a52fe7d2d---77884475766.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/kojag.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/67495099482.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/65436125011.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/77373336681.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/oaoi843iggdsm3rhf64ggaj9i1/nepufizuvedatego.pdfIn PDF document text
    • https://phu-komplex.pl/pliki/file/17900536145.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614580f44426e---kazadoxajewo.pdfIn PDF document text
    • https://kattliv.com/kattliv/admin/userfiles/file/zulobifetopofanafimuz.pdfIn PDF document text
    • http://rem-proekt.com/f/file/7676986239.pdfIn PDF document text
    • http://www.pilatesyoga.hr/files/files/ritixodekukume.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/15450463754.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/r2i7jleol79dqi5qimgb50a2l2/dazozax.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/monejeburisotamexukolobo.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/43501380442.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/87126124619.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD723 17236 bytes
SHA-256: 961afccd75c8e3f9706da783ef4465dfe6dcff8827b12ff5a59e8a4cd0fd90c9
font_01_sfnt_off0001034f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B66 10572 bytes
SHA-256: e52a5b86a28b459b22faec72cb3fed788998a76fee647812d50fdcd4fd3877a2

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