Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2f135fce26721cd…

MALICIOUS

PDF

89.2 KB Created: 2021-07-21 22:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 990d06514da19680d573b39964117b84 SHA-1: fa4b2eb0a6d04fb333d58f683fcdec91feb68ad1 SHA-256: b2f135fce26721cd3a5b292257c831ecc2edbd19fa18c50d5ed476c133cbf2d7
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to other PDF files hosted on compromised websites. This pattern is commonly used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://fipjp.com/userfiles/file/85970549458.pdf In PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/pfuk3tb6cdn3vrg0eetkh9lr35/51434705393.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/bojukomepibumotomo.pdfIn PDF document text
    • http://flomojapan.com/upload/files/22268092287.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a3a57f403---zigatuxepe.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0c20c386e---rokifus.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfd324e892---26381977926.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/5828394a5156ae58fb46faaa25544738/vekifipe.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160df5acca4337---86880584511.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/gibawixamo.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/dofumovogutugodova.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f11f1d4f2e---lisopapobotogi.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/75635689510.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/51296146886.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/54cca96e9fac2702753bd833693e63a2/12720169672.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ababbad36---lezuxazifopiberikimonutu.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/82189664708.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/kvk1gp59c2kd95m1ifv1i2iic5/sidusuzitav.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/b8e6a2059775a4da1527cbb1e24914bb/wejad.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/d1f7d14e6bcfe1f24ea2530085ee68d1/25286948495.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a88f4b3c321---51004172323.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160b879bb4f050---xituboji.pdfIn PDF document text
    • http://15889163.com/ckupload/files/90802742426.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=test+your+psychopathic+traitsPDF 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_off0000f96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96F 17484 bytes
SHA-256: 344e544504fdce4f49378439c5aec696513c930d0bde9a58d001cc17edd13409
font_01_sfnt_off00012707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12707 10496 bytes
SHA-256: 75322b848f83d8900e1adc96ea3f6a16ae5241145097e069e68b52499534cf96
font_02_sfnt_off00013f25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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