Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc89bd455d06e558…

MALICIOUS

PDF

91.9 KB Created: 2021-08-22 01:32:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 62f8213fa4ec4051607892e04490a20f SHA-1: 662bf43ad00ed74de29d14bbc6bab8d24ded318f SHA-256: cc89bd455d06e558f573de46b2550dcd50c8a34facfa44fb017af57d28d35832
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 0.9973

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 http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/88576069755.pdf In PDF document text
    • http://delfosventures.net/userfiles/files/76257500590.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210616_51846DC61C504A81.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/nurexid.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/zerugumexixivajageko.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/lidejozotepoxozexumara.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/44200240563.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a09ff41076e---2961533811.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/xugevasetumevuso.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/nusatovedaravuvesomuxu.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/jididijekekujiritevojus.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160d21c61b3b60---94794087141.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/misevozufurenofovosalig.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/37480156627.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cda49fb8b28---34442913872.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/dojebuvodaga.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5a1c9250c---29456652828.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a5f4bc5bc---daxefagubipejoporifi.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/ramagipegadiwegutatumus.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fe8054fb2---tosobinamipolozate.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5f6a6c027513999f1581e04746064875/18490732140.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/jaseripoteralarakegorul.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/67508325033.pdfIn PDF document text
    • http://nfc.soo.jp/file/92547210630.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/i0iqa7odukj7drhbvdphkho4p5/52079290123.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=forward+head+posture+correction+exercises+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_off0001049e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049E 16500 bytes
SHA-256: 3130888fcf334b96766c2ceafe00b8a71a8edf7319b4d0ebd99eccc5124d3358
font_01_sfnt_off00012f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9E 10936 bytes
SHA-256: 091ca3d188135f24724536854643409cff88cfa6d748d0a290d554d56fbed37e
font_02_sfnt_off00014901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14901 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1