Malicious PDF — malware analysis report

Static analysis result for SHA-256 c35861a447365c1a…

MALICIOUS

PDF

95.8 KB Created: 2021-06-10 16:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 579e880575fbb6fc5cb06f458541b6c0 SHA-1: ab42cd95e44c9200e0444e340843d574ad950056 SHA-256: c35861a447365c1aed8f2de55d8ca47402c48cd30e33a7860c5491ecb43c33d0
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The document body's garbled content and the presence of external URIs reinforce the conclusion that this file is a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://inwebjor.ru/uplcv?utm_term=pokemon+platinum+fusion+rom+hack PDF link annotation
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afabab0ee00---xatipexotoborakatoxesoro.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/1b8db08cdf01d0f560647d1d08f44b66/46648150573.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1386d890e0---pasezazadimisufema.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/e41891d016d914cd3d04eda4b9ec9ac4/rinonagodatotagesene.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/tumufokaratekazaxofabubi.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/d8864a79ca7fd7c740f640845c158ed6/43736448734.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/nujagojadoxibepiwodirosan.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/687622823782a2c781895ea45a14f56a/rizelenet.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/506031dc0ffa0b82fab16488e7437b47/41293459118.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/11919736379.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608eee32c3e09---nerubimaluviwevamufenop.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/f89d25f5b5635ab2ba027cf2af8192fd/fivusolusutebamixut.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/30698606153.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-20/20210520013456496931.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883c544d86e---betozisuna.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001069f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069F 8808 bytes
SHA-256: dddb70912ab7bd70223ce835043f9cb61e6e808543c750c8ff5a628e8f67d074
font_01_sfnt_off0001240b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240B 5320 bytes
SHA-256: 34760faf2432bf6d1cbb0716f187130f5ee6ea9f3b6e67537de86d7cec8f8acc
font_02_sfnt_off00013600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13600 10928 bytes
SHA-256: 1443f176024f9e6f9496c014b7a998d575ba0b5ff9b1bb284010f491e9d562d1
font_03_sfnt_off00015b27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B27 16092 bytes
SHA-256: 49ed56752837e8322d98a1c8d0dd65752df8ec4093eb0874fc25dd77630b1328

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