Malicious PDF — malware analysis report

Static analysis result for SHA-256 5227514d2fdcce8d…

MALICIOUS

PDF

86.9 KB Created: 2021-08-15 10:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 738dc4688668511fa8b262d8d2b83fa5 SHA-1: f0ee9e5da5db8bfa05e705f933619d19d42b4cac SHA-256: 5227514d2fdcce8d978b33593652d29709491420a82aadd5337fb468fec84bbc
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various websites hosted on compromised CMS uploads and disposable domains. The primary goal appears to be redirecting users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/6bb3463be221088beb91ec099c5f17ac/dibarinuvozobenixij.pdf In PDF document text
    • https://ludifrance.fr/userfiles/file/pumelanetonemedojaru.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e37f7ecf15---14834042975.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/69fd9f6fdb28118ecef16ed887091e9f/999593489.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/4af5761cfb12b54a950944d39a586db5/zixezobugidofusimukuneru.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/92151590265.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a864bce6eb8---68429919991.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/13858887636.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608366a75b726---sodexovibura.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b75e202db8c---39084073124.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093d39f2b2c6---seseju.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1608abbffdc5c3---86739057534.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c84bf615c0a---lipuzuvepowijokatoj.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/6ev2d3l8hroreu0km8h0eifr1c/kumawolezorokosi.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/11344358903.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/xijomosajawegibokirara.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/18e60e713e9620f3ec4e728c4d6dd3fe/vokon.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/xejoj.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/kekijigev.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/vasajitopejusuxosu.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e280d84f0de---75117986188.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/50002031162.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/87b79fg6q1bhkhib4h9rsh99fk/dagaremigixunimurufupem.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/97880896864.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/beruzegafo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=identifying+pattern+symbols+worksheet+answersPDF 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_off0000ec4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4E 17644 bytes
SHA-256: 62f3dfe209c8117303c96295e93fc74a52562e45e91fd032ff56b77ba8b6bb44
font_01_sfnt_off00011ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD6 11328 bytes
SHA-256: 00732905381266087b402448b1a23d456d17b1e8e8baedb41f697684c6503f2b
font_02_sfnt_off000134ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1