Malicious PDF — malware analysis report

Static analysis result for SHA-256 28f0adab388ee31d…

MALICIOUS

PDF

81.4 KB Created: 2021-09-02 07:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1d4a224ba05b89339b28b01c41c2a819 SHA-1: a349fc86e483046e815cd1f04b145d88e12b76bf SHA-256: 28f0adab388ee31d7c07bf179f75da60737161146ebd3b81855dc019ee9f2b17
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://doanhnghiepvietnam.org/img_duhoc/files/femamowadi.pdf In PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c425cdd0ee7---satozafolazekujelupixofak.pdfIn PDF document text
    • http://sns.hu/_user/file/gigeridelalumemuwivokerew.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/lubinogadojos.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/jikokovevabep.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/watasoresu.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/15391865741.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/kozotidaribesazinok.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/gevepezo.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/guzugifetugegejetif.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/jumezekarebafalonujokomo.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e00e932a6e---69768589948.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/nutasasimidutozifalopa.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/19167398578.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/3176603841.pdfIn PDF document text
    • http://siembra.me/uploads/files/fevukofogidamu.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/mgomjvvtevt58chp8qrkh04jme/71007534558.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/g8qtfd5noj6bgdvolvde3ktj8p/saxijavekovomixubuzirixi.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/fuseg.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5b067df43c210e7e96b64cb2c2047542/pidufafu.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/80319943761.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc84eae544---vorobovik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=introducing+character+animation+with+blender+pdfPDF 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_off0000d774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD774 11176 bytes
SHA-256: 0e426bc1b0f3837de0f7aac11dca89effad76bfb00cffb10a815d4eb67757140
font_01_sfnt_off0000f0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FD 17952 bytes
SHA-256: f9d2068cd2dd3ff0b4d63469b6def453a12b641f33441c14f4045960b0e09f54
font_02_sfnt_off00011f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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