Malicious PDF — malware analysis report

Static analysis result for SHA-256 601882432313f80c…

MALICIOUS

PDF

85.8 KB Created: 2021-09-19 04:30:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5243eb4791d745b39b3cb26e5ff958a2 SHA-1: f8631c94ab6c562294acfed087ad46eab70efa46 SHA-256: 601882432313f80c781b1401e8b22ffa4e41ebb64415f88a60486a672ec27ec2
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The document body is heavily obfuscated and unreadable, suggesting it's not intended for human consumption but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://zhatuogz.com/uploadfile/file/42779201529.pdf In PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161402e685fabb---29458657018.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/89415174169.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/muwoborenufuwuriparedoro.pdfIn PDF document text
    • http://tnmetalworks.com/images/files/tinofojo.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/mejezizonodud.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbec1c61f2---15738164108.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd943683c5---miwukenufarutud.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/301038187.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210914011618.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614599af63e21---85955695480.pdfIn PDF document text
    • http://vanhacollection.com/images/files/25871977534.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d0c47e3b8---zubogokapibukanigalazuru.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/wifoderupoxe.pdfIn PDF document text
    • http://jainfarms.com/uploads/56822573800.pdfIn PDF document text
    • http://dnepropress.net/files/file/90742472283.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/velawimexijesala.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161468b42eee47---50202506627.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/bixekotirifafin.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/vljr1024035991a02bkepdte2b/mozatuxu.pdfIn PDF document text
    • http://wwsm-us.com/files/file/xabujula.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/60667562541.pdfIn PDF document text
    • https://kitchensofdiablo.com/upload/file/97465066221.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/75526674577.pdfIn PDF document text
    • https://amgaa.org/temp/files/suvowusuxozokezazobaxijuf.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/68689721631.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614521660e17e---76590146093.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=differences+in+android+operating+systemsPDF 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_off0000e89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AC 18320 bytes
SHA-256: 075c9f2c741347b214ea50092164b69219db0f0831f9cfa0543d0d39db48cc5e
font_02_sfnt_off00013034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13034 11032 bytes
SHA-256: b255d11e34fb8bd8b5b6f8b7308924a88c29034341f52d73b17b426ac333b3fd

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