Malicious PDF — malware analysis report

Static analysis result for SHA-256 cacae40cf11bb971…

MALICIOUS

PDF

78.9 KB Created: 2021-09-06 04:19:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 07a75d33fc3d82d0c74f74f2e714b4c8 SHA-1: 53570f5dadc5fe05fb0357da970bda7fbda6a6d6 SHA-256: cacae40cf11bb971440bc1de8842f882f692e070b3c540a8f4d9922af0cf3c6d
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 0.9968

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://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/4tapc8s2kfsjdahtv9c5180efl/nisarubo.pdf In PDF document text
    • https://maconlux.lu/userfiles/files/72680009823.pdfIn PDF document text
    • http://canoeing.by/pics/files/mepokasi.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/99663725502.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/28709226071.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/99081840493.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/82296085613.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca5ca86fc7---rebumujupimusavimidenibe.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/38d26ec9bdc0a919ffbe9f6e65570986/35648990269.pdfIn PDF document text
    • https://fisheaglesafaris.net/pics/user/file/biwarode.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad75fce6ff0---julopujogigu.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/ba73bb3571efbf283d3a1a1207745d76/83094133546.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/kezosenaxuvux.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d66de96143---19508261065.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/bugavamilewolibi.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/nezuvubotosik.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/18568361036.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/s1lab1604ssubimc26ia9e1mmr/98662649900.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a521ac81d03---weliwusedivi.pdfIn PDF document text
    • https://okazionche.com/files/bumalakanopurupanodubo.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/6947448469.pdfIn PDF document text
    • http://ratchee.com/ckfinder/userfiles/files/zosuki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=human+and+social+biology+for+csec+textbook+pdf+free+downloadPDF 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_off0000c715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC715 19484 bytes
SHA-256: e617a0229ffcdae05a354c6b68c510828581f16b2fbf9ad8930e640a2858b706
font_01_sfnt_off0000fa49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA49 11588 bytes
SHA-256: 07b583ad2b350c690c6b4630277a67557614abb9e8573381aea111f0d77899e3
font_02_sfnt_off00011563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11563 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1