Malicious PDF — malware analysis report

Static analysis result for SHA-256 f188e9a1fcabbf79…

MALICIOUS

PDF

88.2 KB Created: 2021-08-08 16:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 267a63946b028bad63de6db0cfbbc5e3 SHA-1: 1343f29039069ca77e21d2ca0d16d3a6536cb183 SHA-256: f188e9a1fcabbf79a6fbb902822619c4c5f4a1b3db614de0520746c5d91ad340
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to host or redirect to malicious content, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/5jkqb0ogmmk4a66uqloulvtpb5/gowuxufipis.pdf In PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759a15b21ea---ruxosagowumebosoker.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/jabokubebalamixavewizediv.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/8qdqbtkpr8vo24r3h006o8208l/romokoxapivuxowob.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890420c01e3---jizirulidabodinu.pdfIn PDF document text
    • http://pauseforserenity.com/clients/1/10/1002a5d8b3740fc7390aa1937d1ec3ed/File/buroseviriveramivit.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/zemuwofusa.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210519074838.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607801812bb8e---wipimamotopikerawulil.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/90358541909.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d78954d80---jidirewanulavakijixegu.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/78095835269.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/11369780023.pdfIn PDF document text
    • https://ckd-otto.com/contents//files/gaduxinatoloko.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/4b22f84132260eabed65a287b56121df/luvup.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/16954298266.pdfIn PDF document text
    • https://baongochoa.com/upload/file/veweroj.pdfIn PDF document text
    • https://dienlanhbachkhoa.info/upload/files/1890536254.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/zokixos.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210802064350.pdfIn PDF document text
    • http://dade666.com/userfiles/202106file/2021062511451170554.pdfIn PDF document text
    • http://keiganproductions.com/clients/863431/File/gufurukimesefirilubo.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/28709115523.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=drivers+ed+chapter+6+worksheet+answersPDF 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_off0000f381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF381 17052 bytes
SHA-256: 006f37dd495e044f281a55147baeab5ebfb4b549410cf2f0ffa9dbba4b51e432
font_01_sfnt_off00012046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12046 10976 bytes
SHA-256: 5921d51a80d278a3e1648a15dde7c3d7b909f6196391a13eb00e79b9627f0fce
font_02_sfnt_off000139dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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