Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf489d3073b6fada…

MALICIOUS

PDF

132.3 KB Created: 2021-06-08 21:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 444ef8f4c5f1a3fe6e8a64442328dafe SHA-1: d9794b66e0319ba7e833eec200897a00f3131fe0 SHA-256: cf489d3073b6fada0cd09dd200f45fcc2a9f8df0ae0579e6407c107af84b39fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=optifine+14.4+download PDF link annotation
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608671a6d3df9---kubitezupal.pdfIn PDF document text
    • https://standardpromotion.com/images/upload/userfiles/files/97387716406.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/21890704787.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/70jbhc99kk0savh7rgqva3c2ru/wofivifitazuxifu.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/qkice7lpdjlb2vgdb4o8l351nc/90023820222.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b75a6f524cb---36453232936.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/f03ec31d51e7b94a0698032abf8087f7/59596088801.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16088f5d877bc6---30281966968.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cdcd3bc5fdb7453069c378df72cdd19a/31055551006.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608b260d1d53e---3264997035.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/17995281474.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b65e4556bad---xojibitetam.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a366407336---20279852369.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d33281bdf7---63036152592.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/tiranafozikeribejar.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/soxavebafo.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160782ba827519---gawowuwaver.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off0000e916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE916 67300 bytes
SHA-256: 46e7848f9545ee2b4f978849d756dd80f710d43c306444f82fb77094d5ee6b64
font_01_sfnt_off0001b3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B3DD 5052 bytes
SHA-256: b7f9bb16bbe43c8f72e1ec5361ba45a467f47a07e9a1d24611de10eeb850ca7d
font_02_sfnt_off0001c549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C549 11152 bytes
SHA-256: 78ba93b96462f3313f8560337ffe50a75cb0bee6d3d98f9b33be1ed947483a9f
font_03_sfnt_off0001eb8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EB8D 16092 bytes
SHA-256: 0ce4f8b47c9991bd1ed0a694d919b88134844ea7ba04d4b6a373289a8b5175c0

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