Malicious PDF — malware analysis report

Static analysis result for SHA-256 4596ea775dbaada5…

MALICIOUS

PDF

74.7 KB Created: 2021-09-05 18:02:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 356772c288f8ac67a26c34c45e13a27c SHA-1: ba9b033265962fa3ab49513c0efde1a4c9243778 SHA-256: 4596ea775dbaada55a52200700bdd524535a4f01af446dab47f0ce2ae8de8860
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 0.9976

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 https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/fe4a10f8f60e9fb0ec4617d19e62f433/87765362083.pdf In PDF document text
    • http://ikcem.org/userfiles/file///12836499286.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092086c42019---bezutatulep.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/35659174732.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/rawir.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/c26fc7df33f000a0bcf451d946439931/55904445271.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/kegonagilotusesuxilut.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/90535986197.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/5ea2b1ff99850820b7e309f857dade5d/80675705109.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/67478846939.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/wesiwovezumigimi.pdfIn PDF document text
    • http://ore-processing.ru/d/files/gisawavabezamewotixoj.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/72097785155.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d27621de75---71696960737.pdfIn PDF document text
    • http://funperm.ru/content/file/tofexolobuvubi.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/4999429031.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079390be6d74---xaranosovapibuwakemes.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/wefegu.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/80770371438.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/41030673704.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/3100981756.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/f15v9nmn3k964mlmnhrb4r49hv/diziwaxusugudawigi.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/birosav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=macular+dystrophy+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_off0000c248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC248 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5F 10596 bytes
SHA-256: 4b1b0ef5c35102a766157d1546d3afe81281ac4cb2cc598016783e5685942f6b
font_02_sfnt_off0000f2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C4 16428 bytes
SHA-256: d45b2eee4d3510c152086fb0c98bbed719bbe48c79bb3de212e0291d44e9745b

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