Malicious PDF — malware analysis report

Static analysis result for SHA-256 d737294aa43403c3…

MALICIOUS

PDF

82.2 KB Created: 2021-08-20 02:13:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f3fc5ec67b80f4b810e6940f914edc09 SHA-1: 633d6414a3f7b3c21f0d754468e6a92d8a3e2e9a SHA-256: d737294aa43403c3fa0b6919b253c981a2cc27399023623f9300c271082110b1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. Several heuristics indicate the document is part of a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://aiswaryamatrimonials.com/fck_uploads/file/novimuvef.pdf In PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/127jfeb6em7obdsl4h3etfr9n0/nazimexegemuzezuvotoz.pdfIn PDF document text
    • http://airsoft1.ro/files/file/27656506677.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/sjrhn1i1lgk3s5ukslh1app31g/minumumemosafaribagudi.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/32917386436.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/futuwov.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/77832170709.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/a83abcf23d6f7b43f5fdc51cf87f9d62/23568043821.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/86749997387.pdfIn PDF document text
    • http://na3.it/misc/file/bogewurom.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/gikebugefasegugugepuwaf.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161145c5a51376---21085766015.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/0221c64efd1515f9beab285ff8f81390/4908411439.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/bedininazamoz.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/desavumasunapofoxulo.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/94220152977.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086e9658670a---54112682446.pdfIn PDF document text
    • http://bellsazshihtzu.com/clients/878694/File/bujujafesilirodotibavuju.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/35809339320.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/d99b240cf65b845d5c441c5d136a50f9/moxebupemubosa.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/94650205256.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16082ae477f4ee---zuzekukijamawajogudow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=green+smoothies+for+life+recipes+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A2 10760 bytes
SHA-256: 63baf6fa01bbe9ca25b35748d264b54bc8ad72a6c50407fc7775a59d0241f9ee
font_02_sfnt_off00010f27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F27 16972 bytes
SHA-256: 76eedbc52e4c378e03d6743cbf2e0a2df6228ef390d31a53bcabc91dec31047a

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