Malicious PDF — malware analysis report

Static analysis result for SHA-256 aad8091b2d4d79ed…

MALICIOUS

PDF

82.3 KB Created: 2021-08-08 16:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2308e891128a8f6865afd2a6f605c985 SHA-1: 773c4f0a00949f2f0128b241abc7db1c28902c83 SHA-256: aad8091b2d4d79ed263924d94b0dadf8f388121091e2a876891e467768f5d418
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=speak+out+advanced+tests+answer+key PDF link annotation
    • http://cnex.cc/images/blog//file/budivotuxusolup.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210606_A4C764A618EE377D.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/ra86v7f5l5lnbtpitilqvi11a7/1362211953.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/popexuk.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210720102154888.pdfIn PDF document text
    • http://santabruna.cl/upload/file/jimopuvosevisakinekur.pdfIn PDF document text
    • https://fallsplat.se/file/57698461221.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160f8522c223b9---45361546036.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/64582149139.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4a4363dbd---pizujixe.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/redinanobefaripimejemus.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/42448986347.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/f728cdhofh1l2cs5d52nhajhvj/gazomimojozawiwekudoliw.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/0ca9cb8240d683bcb5b0bde52147659e/tagejojugurovudapoxaf.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/lanimamisevabaz.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/xonuvenikevenesob.pdfIn PDF document text
    • http://michianaorchidsociety.org/clients/2/28/2832e32407c795c8d28ffe68102aa18e/File/7940809467.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/9ce8b3ddbeaec86522dab27dc2d5455d/24802063683.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/gomufebafumogebunaro.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c9c4c5cce---pureraxogomarevifudog.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c47e17e85d7---34244755060.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/loguxupebeb.pdfIn PDF document text
    • http://ubest.ru/images/file/30381866650.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_off0000d84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF064 10904 bytes
SHA-256: 516ef89e57de44b1abf77a05984304338fa4f3f4457f319d2b71eba9723bd12d
font_02_sfnt_off000109da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DA 18852 bytes
SHA-256: a3c7344d152f59e1477d83cea0f34cbe5c7fa2ee584bdfe7b6a3f28f4ccc4c49

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