Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fbc39a0d1866179…

MALICIOUS

PDF

99.6 KB Created: 2021-08-11 14:27:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 9f5f688b66b230d3bca350bb94f45771 SHA-1: d32c31612fbddb4b0ec6b39705925d538dd47117 SHA-256: 3fbc39a0d18661794328d5e5d49f7becb9e38f496b5e68b36a96c5e388c985fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall detection profile strongly suggest this PDF is used as a lure, likely for phishing or to deliver further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://ajitcoatings.com/uploads/monigaxepefo.pdf In PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/gb2dfccksjcq8s9e02sqie3sqg/2962817891.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099765482db2---zomefudopuvidodaloxelup.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/76615818429.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/tilotulima.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/bec5d4697cc910226be963d0d3836639/29679698245.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/f10d98aa45906b48b29cadbadf6f9704/damekupeloli.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/19911636064.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/32877687324.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/91953080472.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/zobadovaxepajuzusujinifa.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/50795364590.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/70539647053.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/28612229305.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/rudiremor.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/vjugk4a885r3tbtf9hl2hvkua0/mixes.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/9bccee0547bcce45dd16c696256609e8/12942623890.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/uro9ltjoaa69ode7m2naml2n6r/56412247821.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/37492982377.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609253bde3b3d---96026531584.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/63805535452.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/jiguxiwoxodinasive.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608550784599e---zixanogevegudagujaramebaf.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/53c9f19956bf86da6550b19bfd3709c6/lajezunatibugofub.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a2a797198---wovikojujopufezuki.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/dubofolulax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=single+phase+semi+controlled+rectifier+with+r+loadPDF link annotation
    • 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_off00011963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11963 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13175 19280 bytes
SHA-256: d87d53c768986d8ee1558678c070058c88cc4537abea22f3593ea509194c25e2
font_02_sfnt_off000165aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165AA 11228 bytes
SHA-256: 1d9a6dbdad290f34ee361c3091ef8342a6cd9e805d6beb0d4e151c8e95ad95c8