Malicious PDF — malware analysis report

Static analysis result for SHA-256 592f2b085d22f7c9…

MALICIOUS

PDF

96.9 KB Created: 2021-07-27 22:41:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2f88e8da541bc25761cc5753b393c561 SHA-1: 4815fe831e20b3b4f3493bc7dc564371ab5f2e85 SHA-256: 592f2b085d22f7c92c9cdadb62751cf22b64544a182c2561ea743f7b5dd3009e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised web hosting, suggesting an attempt to obscure the final malicious destination. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0a180f4d8---1619221311.pdf In PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160defde733c93---26512876596.pdfIn PDF document text
    • https://bouwservicewinthagen.nl/userfiles/image/file/zefopavasojuzoxumane.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/bb7dc1d9ffdd0b81618b3b3c9240b0bc/48228802996.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abee5e4739d---lurenazonetijigaxax.pdfIn PDF document text
    • https://amblamy.ee/upload/file/98943014704.pdfIn PDF document text
    • http://airsoft1.ro/files/file/viworetasozemurujefowakaj.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160b0192f37e87---mimirefos.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/31287752820.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///gigolagisudu.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/e02482c924e159579cfc7f93eb2129fb/gujikejewuda.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/50713171195.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/l7nlb65uutl4luqo48c3hf1d21/misadufo.pdfIn PDF document text
    • http://sb-78.ru/files/file/xidazasit.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/lodemitezul.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/785211914.pdfIn PDF document text
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/220c24fc33d2226bf0bd59a6b4c794b4/saxefaluvirupiviku.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/a2fab6ce59130e4aa0731b83adb5a64e/sunexufoligiz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be2ad798d0f---36872203310.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/40816c575c2566a6b5f923f67b9533ff/kaveruvugobuxusavofasiz.pdfIn PDF document text
    • https://afayl.com/userfiles/file/dodada.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/75803762599.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608be57e7b5f7---legivig.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/af392c575a3c57ad5feebabf0dfd44af/17954103393.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/vdmv5ic20olk1e7agn2ba34htv/likamexamatujibasuvazipi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=christmas+bunco+score+sheets+printable+freePDF 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_off0000f94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94C 11016 bytes
SHA-256: 21d8e5d27c86e1fa236880420ce7167cec8347c1b090b44f96b76d7899a6161a
font_01_sfnt_off00011283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11283 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_02_sfnt_off0001288a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1288A 19680 bytes
SHA-256: 428422ad5588a4033cd12e8266fc3a7c586c88cb9578dd0fa87703158fb80de0
font_03_sfnt_off00015b07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.