Malicious PDF — malware analysis report

Static analysis result for SHA-256 90ef62840bbb551c…

MALICIOUS

PDF

84.6 KB Created: 2021-09-04 00:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f7ba6ffbccd5ab74fc1349952cf8e4bd SHA-1: f6d484afe9614e9d2525fb3417c2df05da9d6690 SHA-256: 90ef62840bbb551c84f1e04ae4d5b397131bf6a6744e4248439ab1e07cff6f1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://crysiq.ru/uplcv?utm_term=beats+studio+wireless+over-ear+headphones+manual PDF link annotation
    • http://steffis-strassladen.de/userfiles/file/2801837964.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/fafinuni.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/kudax.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/xuromabopudalizibobum.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/q1foitmm6k1fmul2fkco6e3uf0/10699053179.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c65a8c60c---xeludibed.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/9bfd2554da28fbf3a95dbc1f3b6b96a1/7156668718.pdfIn PDF document text
    • http://njchemland.com/upload/files/borizabezidisuzil.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/sefuku.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/zesijejivubamubo.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/17412322227.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/240066fb1562ee211f0ed546df5b21f4/69350645019.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/651cb85e1d1104254baf2d485bacdb96/91319055467.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160767d3688932---sivezufesusew.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/9f7217861175973702a4d58568cff4ca/misuze.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16079abf80d880---foguveze.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/45076201138.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/2ec379d2b5778b59f474956dda2e40b2/jekovoduwisiz.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5aa817ce2a---biwixikedobamogifa.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983f21959e3.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080bac62214e---dowubakogabexumini.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/2ebd356f62ab6189a53e548f2746c1ed/zetixokowol.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/83788084913.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/zunufigirizonuwowaw.pdfIn PDF document text
    • https://aspirans.com/files/file/zitek.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/43411429372.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_off0000e322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE322 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB34 18360 bytes
SHA-256: e1ee9b9c7aa9dfb0ef6deadad3c76073277dabc73771ec91525742f5be2b9fea
font_02_sfnt_off00012ac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC1 10996 bytes
SHA-256: 888ae88ac06f6d19350cb9ffea6453bb37ad09b30d8fff63eddd40b661027f65

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