Malicious PDF — malware analysis report

Static analysis result for SHA-256 10af9a0456dd6acf…

MALICIOUS

PDF

172.1 KB Created: 2021-07-03 12:35:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a1a05e6ac54870a8a753e8d1205c4ada SHA-1: 3e324119d2e1873480a16fd4c464cf7493931005 SHA-256: 10af9a0456dd6acf25d25bbf880434c3cd94be9c9f8ccb1bcaef0eb7a3d609a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure align with common techniques for delivering malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9707

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://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/0r5k28jebe6hlq7dn018h9aicc/41847347172.pdf In PDF document text
    • http://americansemitruckparts.com/d/files/bivuxolafawexiso.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/78555603810.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098acdbebc3d---wisuzadixikar.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/93651916735.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609732a083bff---tujisupuxazewejisiva.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/229c93c88167e468ee8045866255d20a/13980536491.pdfIn PDF document text
    • http://briarcliff68.com/clients/71184/File/2096439847.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/qh5p944dr0enj5e737cpqg7am3/3854803898.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/42903320635.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b36772ef4c6---ranokipolozasepewafenef.pdfIn PDF document text
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/57637491351.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44715677158.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7e25d5734---43806264692.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/1156092567.pdfIn PDF document text
    • https://oklasik.com/ckfinder/userfiles/files/ziduz.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/021c21eed3334879224e2e6cca4e10c2/15398002993.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/3dd234f59bd61cc85e857145c5115273/bokitutupuvemofatid.pdfIn PDF document text
    • http://bhsclassof70.com/clients/a/ac/acf0241a72c9eb28a719a759cf8a4748/File/60056989534.pdfIn PDF document text
    • http://aquatrustfina.com/userfiles/file/vivodejolabonut.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/wojopisizo.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/d5c60ed80596d51bdb9a83a8c2ac65c3/82143072786.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210621170631.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160801c3ed221b---40630362370.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=mysterious+female+charactersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00022b2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22B2D 20092 bytes
SHA-256: afc6322e34e618e01bbc06d191692f3743aed04346c8f5d332d97513ba1a02fb
font_01_sfnt_off00025e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25E0F 10704 bytes
SHA-256: 29577053236614fcfac7c5a75342ec87709ce82040a24e88b0b785ca528222af
font_02_sfnt_off000276a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x276A7 5296 bytes
SHA-256: c95c5a153e78fc8080c2b718eb45a689f5b51dd253e1c192c0bab702423773d1
font_03_sfnt_off000289fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x289FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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