Malicious PDF — malware analysis report

Static analysis result for SHA-256 de94c8e36aa45999…

MALICIOUS

PDF

85.8 KB Created: 2021-08-02 17:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 60a66322c8a8dad58a943331aee3c058 SHA-1: 913f5035810282c6eacc723216a93e248a64e617 SHA-256: de94c8e36aa45999e256bd726b460cc72fb84f11c9eec13128491e691cee9039
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, redirecting users to various external websites, many of which are hosted on disposable domains or compromised CMS uploads. The embedded URLs suggest an attempt to lure users to scam or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://catamma.ru/uplcv?utm_term=why+is+my+bobbin+winder+not+working PDF link annotation
    • https://ptkas.com/kingkong/userfiles/files/1354484432.pdfIn PDF document text
    • https://solucionesinmobiliariasavg.com/ckfinder/userfiles/files/paromob.pdfIn PDF document text
    • http://zxsolar.com/d/files/visoremomelaxiduxijap.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/dovomajaleje.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c8d9b852c---63972028802.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/83710170696.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a90e77c4c4a---35734581067.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/39912753615.pdfIn PDF document text
    • http://schokozentrale.de/idata/95371768855.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/nf86g6lgalsecqo0r5mk7imdq6/kedonibewaruf.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/e2545c04e57b76b60864d5e00ee12308/22825389562.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/dajur.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca4da33d69---65633092350.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/gejuse.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/a79f844495a589c5ec4e05dc7016670a/kedobujonukiti.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adc72391a94---kajawatipunolizugu.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/90kk0umudlnm81qbgs69m3b0c2/vebonekovererilokunonas.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827179cd765---xajusurogak.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/95383171344.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/sajusitalofuvujozi.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/1313e6eea3a09f6dd44cbe07a2f93f96/57108203554.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62372df288---7335436134.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/baloberiwu.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/6091643835.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/9818077087.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/zovubazavonudini.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_off0000ecde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F5 10912 bytes
SHA-256: b02f458fab3e5409a24e8e5442ea7753ca360a7a647c53a6b3a60e4ef559ce13
font_02_sfnt_off00011ddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDD 16932 bytes
SHA-256: 072bbdb93b3db5fe5b5deb2c3747e3d29e0484fd8722f49a43ffdc4041878391