Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2bc230506c1654f…

MALICIOUS

PDF

116.2 KB Created: 2021-09-18 22:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 24f372817ba245f644d003e16fc5cc54 SHA-1: 70809692ac84d471247e3c1663cade342e4b8817 SHA-256: b2bc230506c1654f1fb6d4467721b559fa5405465cd3681139347549429ff055
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting a link farm designed to distribute malicious content. Heuristics indicate a link farm on disposable hosting and a high ML score for maliciousness, further supported by ClamAV detection as a phishing trojan. The document body is unreadable, but the overall structure and URL distribution strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://archism.ru/uplcv?utm_term=cengel+mecanica+de+fluidos+pdf PDF link annotation
    • http://wjcopy.com/upload/files/wisip.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/pomurodenepo.pdfIn PDF document text
    • http://husplaza.hu/editor_up/24756788769.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/gibunesagizeka.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/1a475b290994e730d355a495108a2af7/zuzobokukigixiluliwujoweg.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/rofidutemawunakikut.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/72254527244.pdfIn PDF document text
    • https://senfina.top/uploads/files/20564886563.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/xoserowop.pdfIn PDF document text
    • https://yensaovinastar.com/media/files/kenotisegerakutifoxixadu.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/momezezakitaluzepolok.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306b219c250---67924049168.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/12105536695.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/54939987951.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/mazesez.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/63894755351.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/tidoxiderud.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/lazewef.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/xomuxixapovel.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/74696782213.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/7370047652.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/vo8oitmqq1clcgrukd1sf0hr7c/69899639013.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/dikajopujokakobemuvelu.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_off00015a63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001727a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1727A 10896 bytes
SHA-256: 9d230afd719e25b8dcb5accc968bd228ff960156ca0456cef3d86aeb0255f2c4
font_02_sfnt_off00018b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B78 21876 bytes
SHA-256: 9f8218e62ec2615fede551e93e43bf742e8f015303b321981625aee66d420628

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