Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4df5a9603f24ea4…

MALICIOUS

PDF

67.8 KB Created: 2021-09-26 02:31:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2ea64447d47aaca5c78af3c46debf7f5 SHA-1: d19c18d113446a95cfac3519b668c93345ba0c89 SHA-256: e4df5a9603f24ea4bd86fa743c77fd11cf00936864a1cc9ce3753ad948498316
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious content. The heuristic 'PDF_IMAGE_LURE' indicates the document likely uses a screenshot to obscure a clickable action, further supporting a phishing or download pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://coretry.ru/uplcv?utm_term=power+words+that+start+with+r PDF link annotation
    • http://reckdance.pl/userfiles/file/molimovofukafirolux.pdfIn PDF document text
    • http://drtamerturan.com/file/90760667328.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210906140103_YmVydXJldnVwaW1ldGE=.pdfIn PDF document text
    • http://nprofit.hk/userfiles/kuguwagomekesusix.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/tezebate.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149665002ff7---16172778258.pdfIn PDF document text
    • http://chikatere.com/Upload/files/20774991328.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/10788441150.pdfIn PDF document text
    • http://compsult.net/userfiles/file/purejarizowubuponeg.pdfIn PDF document text
    • http://congtyvima.com/images/Download/zowumabutumiwo.pdfIn PDF document text
    • https://actorconseil.com/files/file/tuvevapedul.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/muredizajigufenipekovo.pdfIn PDF document text
    • https://csodamalom.hu/files/files/mirevekexobezalugeka.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614816f1e349e---mukakapufapenonix.pdfIn PDF document text
    • https://umartravel.com/files/63864119314.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/32349450717.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/81102407961.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/xufetivuzarinamanitenuneg.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/55353437290.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/4676535165.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021913174564890.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/60953400624.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/7f8890b882652d2fbb85e2b5f0e4b562/84894714999.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_off0000ae51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC668 10280 bytes
SHA-256: 0a103ee9658ae4ce5ad2ad7deb13771a49a6007d5e35f5f03946407ffa881319
font_02_sfnt_off0000ddc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC5 14208 bytes
SHA-256: eb902ab70b8c5ac93a8c082e866941fbe3da1d2bed22ae9f749620d8fcf1d5ff

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