Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e9ddf8d603e43f3…

MALICIOUS

PDF

84.0 KB Created: 2021-07-15 13:34:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4a9401b2410f33c5c557edfdb06ce977 SHA-1: 938039511232bc1feaf7c339301d8a77b9b953e9 SHA-256: 7e9ddf8d603e43f3786dfe3b3da14edfb7abf73050b74633cdc78fd6ede66c53
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of compromised CMS upload links suggests an attempt to host malicious content or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://crewmak.ru/uplcv?utm_term=what+is+10+root+2 PDF link annotation
    • https://ludifrance.fr/userfiles/file/19592711915.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/mekafolanavikub.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/63309739015.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/22744699957.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/gadufoxokide.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/fobagelokepagumijopuzax.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/bufunuverozelijopip.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa99d853155---magetisegusetoxawo.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081038b4dcdf---jijoneraw.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/dodegakajonudoxonogik.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/a7596dd3c34332a0ade41212b8c050de/93642629926.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/63554770552.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/67f7876408628fd56d2386fb161aca19/tenizib.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160837dec0c2d2---5644604399.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/4033299762.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/kunax.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cdabfe06322---62532410462.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/31256854553.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/0cad61800bd63a2caf8ca12ae7cdc113/41353318952.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/afd50cc2e34feba63fa64f0e9605ad59/88476687322.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/rajineva.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/77840604694.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/7pilr8rhj4f6ncivar1jbjdfok/topaxemoju.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824bf87b658---tapezano.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_off0000e6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D1 17368 bytes
SHA-256: ae6abdd881c847950eadb1881b628ff75a2a1c1f620a7994c3bab01639032748
font_01_sfnt_off00011416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11416 10208 bytes
SHA-256: cc478280bcadaa32faab747512efabe48996fc789da52fb794aed92f9ecffd25
font_02_sfnt_off00012b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1