Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee817eaef4e1b8c9…

MALICIOUS

PDF

85.7 KB Created: 2021-06-29 21:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5751267329a724acc623997d2bcd2f0c SHA-1: b8fb80599d0c53f21131a3ebb5e80561606c15ff SHA-256: ee817eaef4e1b8c9a25f8312077bc1d55b19d7ae51c806e4e5a358cbf6ad3394
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and link farms pointing to other PDF files, many hosted on what appear to be compromised CMS uploads or disposable hosting. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The document's structure and the nature of the linked URLs strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crewmak.ru/uplcv?utm_term=the+coconuts+marx+brothers PDF link annotation
    • http://gld-lining.com/user_img/files/zovifiwi.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/18849610992.pdfIn PDF document text
    • http://maihome.hu/admin1/file/17507316734.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/kugugojumenemumixi.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/81910526473.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/towujosofakurajigik.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/zonezuxaseruxiwojeluxa.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094691907e1a---46103355976.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/31468352062.pdfIn PDF document text
    • http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/pomivok.pdfIn PDF document text
    • https://bem-sa.com/img/file/74659733574.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16094a991d297f---gutikik.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/802bdd39f77880787bc6d3753f162778/kolowebibuwulubobowusipa.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/f67243cb0ff285fd61b3f69f67793919/vujan.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/ffg77jjja85nbao4r0q0ee01p5/70095918301.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/12472934242.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/25764718278.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608df724af5c9---tonubaxoveleb.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/jiguwufigexibedokosopagid.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/jojizafesavivevikavuka.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/3aac0a0fb81adc19425c944034f95386/17366159313.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/wuwoxipedoteresukuwobidu.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16085ac60139dd---72067219978.pdfIn 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://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_off0000eb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB44 17620 bytes
SHA-256: 452ee5c011db46bba4e13b3e75cb06de9e34ebdff6b596ada94f323280cf9d78
font_01_sfnt_off00011918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11918 10664 bytes
SHA-256: f47538f97d4daa295dcc5dda6a4491fbee6651f1fcf3d71f4d8ab1551346c70b
font_02_sfnt_off00013167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13167 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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