Malicious PDF — malware analysis report

Static analysis result for SHA-256 48b74520a465667c…

MALICIOUS

PDF

80.2 KB Created: 2021-09-21 00:59:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 36cf8585a6cea4c9ce06e835e2617ab7 SHA-1: dcaed7392e90b8f57ea9d3090409e15999abb8e8 SHA-256: 48b74520a465667cf7f6e6ea0d5658eee066efff6da5e2385256e3484cdadc48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites 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. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://irlanc.ru/uplcv?utm_term=how+to+export+iphone+contacts+to+android PDF link annotation
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16148d410551b5---36522653187.pdfIn PDF document text
    • https://ms02bet.com/contents/files/31045714489.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/63068172225.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/30018260773.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/gegegoxabimi.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/25914203048.pdfIn PDF document text
    • https://yellowstonewildlife.com/daxasiwisigadig.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/894e8a846ac53c876808d702c594206f/19557604975.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/fileserozedukej.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/14625847188.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/fed92d158c23ad6ac98fc5e3361cda08/32533544246.pdfIn PDF document text
    • https://braus.uz/images/shared/file/wuwudapatemudenedefezewo.pdfIn PDF document text
    • http://irodaszer.lukinserv.hu/file/jamulubevewurapar.pdfIn PDF document text
    • http://xycrusher.com/d/files/80453560438.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/totelebofejejotiwax.pdfIn PDF document text
    • https://33mobility.net/uploads/files/23323191219.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/reselotiben.pdfIn PDF document text
    • http://halaljones.com/uploads/files/61772076806.pdfIn PDF document text
    • http://lex.tj/img/file/vamefufonisalufaz.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210921051933723919.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/vamixeferiruwonutarinux.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/80587075215.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_off0000d4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B5 17800 bytes
SHA-256: d0e21659a444f71798abe4b67b0cd9099d24a20a017618ac54bd99629a1d29bc
font_01_sfnt_off00010298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10298 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAF 10744 bytes
SHA-256: 91c0affe7cc4fb1de8469d6a8059f4622db8df7923866a1878204020bfd3ac51