Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7461a118eb5328f…

MALICIOUS

PDF

93.7 KB Created: 2021-06-28 10:19:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 439a59c1831f3ce9f3d3ff94087671a2 SHA-1: 66b489d27b5be568dcc6b7b2809cd63581916c58 SHA-256: f7461a118eb5328f490368393c885dbe2dba68ff12b06a816ed97b7c5f10f2ca
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely involving exploitation of PDF vulnerabilities to execute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=types+of+joints+in+carpentry PDF link annotation
    • http://overtonnation.com/clients/f/f9/f97855507a39dfa58978186db9bff07a/File/60322983119.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/nanezukilano.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/04oe8hl3o8s326srofs3ku8kct/zijujamidefodamubimer.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/larinukuwofejosapizotajux.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/1bbka3k4nku1hbjb2nqfrvmpfq/50693220404.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/bagesilipugigowakowuto.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ee45bab2d---nodigogonokuxam.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/889b54c190dd78f20bb2cd685fdd5f7b/67398744477.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16086194f2b30e---pojew.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160873a0ad5145---36177378657.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/8e9e2acc755632cf44647af677820dd4/5907699439.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/41397707814.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16095ff910abee---kagirivanopiwofa.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/83135824547.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/juwezelamisogavejaze.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/19de24cb27e908d741e8a05284eac25c/73004180332.pdfIn PDF document text
    • https://lecapsuledigian.it/file/93741130956.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///zimiwozutuwokalutowe.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608033762bc55---25617295686.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/5r6oif0p4kusaneabogkbg63o4/muxokokabupotufuvupi.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a94dd3a46f---28127011434.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce7aa621d6---28303794441.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/fereroxofiratuxozoxila.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a992ea13f---58016536786.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93965702770.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/7747069381.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/fopuwonisi.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_off00010d54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D54 16740 bytes
SHA-256: f58259725fc0133b414d80abaafdf88fa5e623fcde68e6c0738c2309294a451f
font_01_sfnt_off000138be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138BE 10636 bytes
SHA-256: 9872b42a945d7b86db2d17d4e0e1110fa2023b39504c9058f730eb11dace652d
font_02_sfnt_off0001513f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1513F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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