Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec3d057459224ebe…

MALICIOUS

PDF

74.7 KB Created: 2021-08-28 15:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 639553a5a0391c46b8d954ff91d976fe SHA-1: 7c2b57c4446c587b039474d340c587be423d166d SHA-256: ec3d057459224ebe3105ff572090a22c8e9494739eff624a5c22c3ddff06f5bf
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/199b5001c31118983346aa281e8e6204/woxujapixipavifenapopisu.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2d527a566---2842821633.pdf
    • http://russkiivopros.com/images/FCKeditor/file/5684233589.pdf
    • http://studiopassarotti.it/userfiles/files/17381773692.pdf
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/99099970362.pdf
    • http://professional-tuner.at/uploaded/file/56997294787.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607359fd4f8f9---nidivapukadidajoge.pdf
    • http://xedaphcm.com/luutru/files/79346558869.pdf
    • http://cukiernia.eu/upload/files/bizudej.pdf
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/liwuxotofidi.pdf
    • http://e-park.es/img/uploads/files/fubozavidev.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/2a417281ca1e0e562c4a9eda1ea440bd/24926306386.pdf
    • http://k-souz.com/userfiles/file/75900353751.pdf
    • https://birotex.rs/images/files/wejapeja.pdf
    • https://callmarkinvestments.com/callmark/files/govofulum.pdf
    • http://wsm.hk/images/uploadfiles/file/venufuboninifej.pdf
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/64100621643.pdf
    • http://visit-pune.com/userfiles/file/vorosidut.pdf
    • http://agendaalzheimer.org/files/galeria/files/7424492274.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/uq8lf7n2jes7bfhtfutgah0gog/waxunobowarexil.pdf
    • http://mxag.com/upload/browse/file/sixovepukupugapa.pdf
    • https://smartstone.ca/userfiles/files/76725698323.pdf
    • http://movietek.vn/hinh-anh/files/rebopujifex.pdf
    • http://proreferee.ru/uploads/ckfinder/files/zazenijigasipunuragud.pdf
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/zeruzuxatefepezipuz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=ace+english+grammar+and+composition+class+8+solutions+pdf+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be4a.bin
397ace452b33538cd97154cd10151537045100589bf3cbd268fef9d7856501d9
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE4A 11444 bytes
font_01_sfnt_off0000d8ff.bin
1577c939af13d5801cb331270c817c271c522bf237dc0ed1826a304cd1ea974f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FF 16908 bytes
font_02_sfnt_off0001047f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1047F 16792 bytes