Malicious PDF — malware analysis report

Static analysis result for SHA-256 1db66ba54c4bbf03…

MALICIOUS

PDF

76.5 KB Created: 2021-09-02 22:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7acf1d180053793b98e97524642e28d9 SHA-1: b05479dbd26f82549a92ea454e227279c2b0405a SHA-256: 1db66ba54c4bbf037221cf6d485d92a1c59cc065179065a38642a6ca26bfba35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to various websites, including those hosted on compromised WordPress installations. This suggests the document is designed to lure users to potentially malicious sites for phishing or malware delivery.

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 https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/247064b24d52af18c0773419a9154298/munobaxixod.pdf In PDF document text
    • https://marblo.ph/app/webroot/img/files/kipamagejewimonuzowuji.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210702_804044FEFD38651B.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/4f37b32fc4344442f061b6b2894b91de/mejegofubonubitoxamituxe.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/3787459123.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086106c483b7---doxupeveniker.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/qis784bmhdb9ff0f9kqgsdjte1/73040478620.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210527_CB00320CFE9E414F.pdfIn PDF document text
    • http://fygl.net/uploads/file/271601302867.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/shuoom2ltimr6dd3eh1q2d058n/midizit.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/77165487354.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608668eee1ba8---3979465542.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/28712891924.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e43ef09ea0---tabetigigadu.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/26296932132.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/4c9vf1u9nv1q62cubeqbhjnrin/21715895227.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878b89e3176---suretinejipojaliton.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/rotalidepibo.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0ccd2a701---54228280578.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807a2e0ad1b---xakodopatavaxokufure.pdfIn PDF document text
    • https://kamarkosong.com/contents//files/2143493354.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607197496eb16---wekolafewizatekuvezob.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/3a0aebf3a7bac42a148a73278a183c73/4571377877.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/tivegexosisufil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=liftmaster+gate+opener+manual+la400PDF 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_off0000c622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC622 10956 bytes
SHA-256: bbbcb8153882255826287ecf07844d2904a6dbcaba6685b65cdbffc917d8cf33
font_01_sfnt_off0000df8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8D 17216 bytes
SHA-256: 5171f6e82fa80229327f6776668a92146301673a1c84c652c8912b5e6f969e26
font_02_sfnt_off00010bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1