Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ae39f1caf049c3a…

MALICIOUS

PDF

83.2 KB Created: 2021-09-06 22:34:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7e2fca2149a6c18211cc8a24bf6ee0a1 SHA-1: e18fd5d9a21d51472632c47344b622c5e778b979 SHA-256: 5ae39f1caf049c3a0e2e226213b84408e8d4b0e8af8980f073d2b3d8c378cd30
176 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 raw IP addresses, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://brazilairporttransfers.com/ckfinder/userfiles/files/sewidavidamepef.pdf In PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210606_004832.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///94419948643.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/visilevazuwurimem.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ad0f4c269---mimufiguwipagas.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/1e76641992a4c0ac62599e0416493c77/62074845287.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f52bf0aebf---wiwetajoborul.pdfPDF link annotation
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/c9af1a371aa723a07c107aaf96ac2c39/34901957233.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160dbb383a1e6e---fotasosame.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-8-6/20210806193729695653.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/21515405392.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/pawasenebizojesolikuke.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/sebewozetalofu.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8b6b13ce0---tipowiwubu.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/19289701561.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/najalumedikujanubavusor.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/13517778579.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210629_12F422050643AF80.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/kizosufegadafanijejifufir.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811b9b0bb56---wuvapama.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a068db9c64---gapulumikofaletaj.pdfIn PDF document text
    • https://2winit.com/Files/files/sujelijekolizovosokirano.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/xipagiwizawalovasigenugus.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/joziduwubirafedadup.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9095d9cb1---fifuzejomaripiverefi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=100+deadly+skills+survival+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_off0000df41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF758 10616 bytes
SHA-256: 83431cc49b9c3cd9b563a66f1d61eab4bf3165b98bfe437aeebbcdc420cf0ba1
font_02_sfnt_off00010fc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC0 18032 bytes
SHA-256: ce0ebe321f1a93e06c5aaf1e425395d5a71cedcf0a5a08934c366b345d0de2dd

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