Malicious PDF — malware analysis report

Static analysis result for SHA-256 3def5df8db2a86e4…

MALICIOUS

PDF

83.6 KB Created: 2021-07-08 06:43:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7f00a303ad0a0e8f883c5adff51767e4 SHA-1: 57b5cc254c31989ddc8bcd18d0da43638a15b556 SHA-256: 3def5df8db2a86e4290e241c290541cb5aefd38019e575118f4caf9ad91eef5b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple potentially compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/3c14bf3033ddeac52008ab7e1a34294a/34730505327.pdf In PDF document text
    • https://balaji-technology.com/userfiles/file/pajabatojuwu.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/97065313669.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/31387584952.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/18710065880.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/05f1d4e0e07e28aa9c99d0d908fec72a/vifalewa.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/72566996507.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084aedf64e9d---xefadexejuwu.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16075d6ad54610---93203273953.pdfIn PDF document text
    • http://garderoba.sk/images/_file/97392219471.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/nanenivoso.pdfIn PDF document text
    • https://sy-tech.eu/file/58577657289.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607a75e889f3e---31060470997.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/toderinuvivevijuro.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d63785c5945---viduve.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821de710044---78485354112.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/d150afcb6073e550ccf2bd875584c1a2/90771462874.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/57087286443.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/70740995539.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/ei0ljuk8m5bd10jflv5s24c75f/27877476148.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/op57ne6ue47rhadq2pkonml92h/vetiwofo.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f329b142cd---37176927374.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/weboseveruposesodovovolus.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1rqm0qbioi2gac33dg51sqkqq4/83542112465.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=bootstrap+datatable+w3schoolsPDF 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_off0000e32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB45 10864 bytes
SHA-256: 9fe44b30545a680a7623e579d98d4a528b885405dbb839a3a721ea06f3edf136
font_02_sfnt_off0001146d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146D 17028 bytes
SHA-256: 3c72a00029cec7a98e9b96147c99316722c0c9171575459bd4cc24777237e330

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