Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fa654daed976d03…

MALICIOUS

PDF

80.3 KB Created: 2021-09-02 16:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2aeac627e792110b5dae9af31371a1e4 SHA-1: ad6da261cad6bb8cea8cbc053b684f88c642b027 SHA-256: 8fa654daed976d03cf7d99821fb2686483ad1990f6bc9d077fd42e936948179f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm with numerous URLs pointing to compromised WordPress upload directories, suggesting it's used to distribute malicious content or phish users. The presence of multiple unknown URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160845d1c9e931---43117843424.pdf In PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de7cb05930---wunerokikegita.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/56492188653.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/tivomexasepawovakuj.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612a3d7deb6ba---tagadejagadipajar.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/kimawinovozitutezimukuvug.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/92546413722.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/0216534c68688f68a71409c0da4bc89d/16831487187.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609499fd5d3cd---46979553101.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/5dcfkpmn9ffipkp96jg90v5spu/43650802180.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/31035391193.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/72708897700.pdfIn PDF document text
    • http://orel-trinity.ru/sites/default/files/file/38853992575.pdfIn PDF document text
    • http://texmet.pl/userimages/file/65549759893.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3193cf1549---jerenajibagorikorezoworo.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/dawobidajagerizi.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/465938c76411a373e285ed46e93adc6e/puzowezago.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/88828857118.pdfIn PDF document text
    • http://dgjst.com/upfile/file/20437361504.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/zejevitukibazamisunumo.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/golalomelamepukisijalus.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3d7734592---bavosinewazebafuv.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/l61lv3dup533d2prklrt2iut73/mobumu.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2f9d1eba8---pugadux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=convertir+pdf+en+formato+epub+para+ibooksPDF 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_off0000d0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE905 11040 bytes
SHA-256: 23b3107eebd8f5c3dc392afbde4220f2535d59a788c5b1f6495e19679d95512c
font_02_sfnt_off0001028d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028D 18484 bytes
SHA-256: 5d2035502a88c6edfe406be63c5c4bc2279c7aa15f117a46c3b3fa6bbf432bcc