Malicious PDF — malware analysis report

Static analysis result for SHA-256 71888f9f0d4154f1…

MALICIOUS

PDF

111.6 KB Created: 2021-07-15 13:38:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1d35cb2718f0654de37040ac3a9f5c67 SHA-1: 68f0d880de66e6dee4e7a2f8bfd578423048efb5 SHA-256: 71888f9f0d4154f13ec2ba465c8f5c8b1dae04daaec7104202a799ee3ac9a5c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, utilizing compromised CMS uploads and disposable hosting to redirect users. The embedded URLs, such as http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8db8154dcb---kuvumofoj.pdf, are key indicators of this redirection behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9664

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/b8aeeb77f7d805bd871b304cb602dc7c/67872032711.pdf In PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/94pm6oh95l2891vi3mer53gec1/gereroxumow.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8db8154dcb---kuvumofoj.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607981bd072d7---salojubogiputupol.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/ludegusabuso.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/sibuk.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/a1aef6af1251b05feb28e23c68a6cdd9/54651782991.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af9e7538e3---14922803781.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/44901949274.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8b3eafd1b---18403421744.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/noxodibek.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a67ca9cdcc7---20731556363.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/vulafisupurebomibori.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ce57d7f7f---genej.pdfIn PDF document text
    • https://moscowfashion.net/content/xuploadimages/file/90059763338.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/pfs2gblhijjair0nl14oio31od/nafutilatafaladofubenube.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/54a84f1a622db3322021cc49b1054714/48707557944.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/tijokifuwuxobekegeselar.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a848403a13---danosepanurepoxufapubogut.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c89ced504---rituge.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607daa652dd96---90548439034.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/83143514556.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/3d3a1658c9baed08b575f6c5e4e08d35/24484691774.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d36719e48---79926054019.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=a+ghost+story+chinese+moviePDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA9 10632 bytes
SHA-256: 8451f367551502fa3ac6db6449781a84de183268f8efe0de2e846a5249fcaa1e
font_01_sfnt_off000136ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136EA 18820 bytes
SHA-256: fededd36906f65d697afa3bfd57ad76260908b872fd051ecf91e52ce820c4033
font_02_sfnt_off000167b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167B8 16216 bytes
SHA-256: 8c2e9d80d580d08964a5048de7b59c27befd741f1c379efd0abbd599686b3e88
font_03_sfnt_off00017d65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00019572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19572 8020 bytes
SHA-256: d38817ab20415b01cfc30d816c211f8e710ad019145b56569b3999b1a13da8d6

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