Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a133c28e8449eb0…

MALICIOUS

PDF

84.4 KB Created: 2021-09-09 09:45:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d99b872d0f6cc016219618f24d04fdbf SHA-1: 9c8e564f078abca8a92dc3f4b53be241382f830c SHA-256: 3a133c28e8449eb0559ded12759d8fd064ea0eeb34b4ae236d2bf4b28c9f5bb1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to redirect users, with one URL specifically mentioning a game mod APK, suggesting a potential lure for users seeking unauthorized software. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://smidgel.ru/uplcv?utm_term=draw+a+stickman+epic+2+mod+apk PDF link annotation
    • https://bomberosdenavarra.com/userfiles_nexo/files/vegonudukukejomujusu.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/sififid.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/7e22c8e529d0b9ccccdcd101ba12cfb2.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/gafex.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/mawobum.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/mikumurob.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/70250758697.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/70376944224.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/75476336880.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/58262122382.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/ritirowozapegezoz.pdfIn PDF document text
    • http://rs-entp.com/upload/file/78405064079.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16133eca003f4e---31816951480.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/86137512536.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/92810049239.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/58974bb4f237746cb32f05e7117416f4/jozunumofezamuvinoxawoz.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139340937da0---192945948.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb87aaa493---zugizigajixoxuvutivo.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139619fde833---26477638620.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/73276473716.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/xolizuvizuk.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/5571854201.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210908211322.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/66637604955.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_off0000d9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CF 10928 bytes
SHA-256: 6f10ad546ffe25f2dc11de836c333debda6479ce7110a8fda1c2475848a2e484
font_01_sfnt_off0000f33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33B 22012 bytes
SHA-256: dc731f1748f3a8683a88ae8c6b625e916b0beab83df3bd7f90de6b2c657ae04f
font_02_sfnt_off00012c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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