Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bde2b87ecb82ba1…

MALICIOUS

PDF

88.5 KB Created: 2021-07-02 22:26:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7b516c770b0525890ab0f90e5f1fd1d7 SHA-1: 807f4cd306f52d2b5c6947b6e97bcbc3c9d13315 SHA-256: 9bde2b87ecb82ba197a2a41fd81570a51fb030412314f4a7f5dbfc5f17043d4a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories and disposable hosting. The document body is heavily obfuscated and contains no readable content, suggesting its primary purpose is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://villa-carlshorst.de/sites/default/files/file/8721596409.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a60cfbe723d---nivuzuludesekiduses.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4fd6ad3c74---budogan.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a807e9d000d---folizoxedozivesuvi.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/68d999e6f46b598340670650a8038202/figitozepeduguru.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/f843213beb1fffb831a72c4f227a0251/69136530004.pdf
    • http://beachhigh65.com/clients/879402/File/64306000358.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c927439221d---46202631902.pdf
    • http://phantasos.org/userfiles/file/rajikofovefezavun.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b70d84c2277---wedanezofosasanukisi.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e1dd030e5---1170111919.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/afdafa330f90570d230e4fc7695e688c/dekamuzexupigurulala.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c24e1495dbc---xudiperomivasefejotexe.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/4ko71ptn2jnnpl1rm3kt3uit30/23965489940.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e9a2d96ee---jajefezivupofu.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3bb1f16f9---39687288745.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a35d32afa08---39993417454.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607f873fe489e---kirozufujatikumivu.pdf
    • http://kardelendalgicpompa.com/uploadfiles/file/66416134119.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/118c9d09798aea2a67a5982d27c011ac/37992633113.pdf
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/16463957931.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/6fed1ecd9aef6f13be3891ee6eb7d86a/zugusatazuveg.pdf
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/1a8e923771a3a3d72b89772d2f56df49/92046384960.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/b006f9a3283f657c163c0005303346c6/jabaroxu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=the+first+time+we+met+poem
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f67c.bin
a4a4c9a6233738611d9cde96c37eea8022b896c498c260e891741aa503d4d76f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF67C 17784 bytes
font_01_sfnt_off000124fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x124FC 16792 bytes
font_02_sfnt_off00013d13.bin
f829fda206fa7e47c88282318d6a32974d29a58f9759c57663cdf2fa60494141
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D13 10360 bytes