Malicious PDF — malware analysis report

Static analysis result for SHA-256 de82c718cead5742…

MALICIOUS

PDF

89.7 KB Created: 2021-06-26 04:13:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 17314a3978fc8bfc18d38e5e1aeab376 SHA-1: 06739c99ce48a53d5b047e59e57bba554e75be29 SHA-256: de82c718cead5742b28b085faae1b5f1520d65a7e54f4f9bcbd41ff0c5df5100
156 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites using form plugins for file uploads. These URLs likely serve as a link farm to redirect users to phishing pages or download further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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://drafthe.ru/uplcv?utm_term=fll+to+fpo PDF link annotation
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/ajuh3ch6go33gfqjq4m5c2eunt/vuvufikixowajukofobo.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160aa87ff6abe6---fagizobomovawuzunog.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f315f87db4---66666887821.pdfIn PDF document text
    • http://liyangah.com/Upload/file/3701477291.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/bvieajb3mhcblti7i8jja6ee70/fawefogifa.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084f70061785---gowefino.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070bd56ee836---xibidatorinuvidaxudiniba.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/9115254412.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/gifunesateligirovifef.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/ar0f4d9icfib6s6tqjoj6oqon4/33690332171.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/47745371854.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/jgmp0katmt5r6iirn1l40om09g/10552214832.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/0ebab2ff8019132bfcc01017c888eb1b/jepulakon.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/57899317367.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/dokatijipenuxiva.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/rei91kpbqgvbufdqobm4c9krnc/47899103924.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/52012629483.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/f67dvd6ppjhbpsgm7qim6lfer6/81187602314.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/7ao86k6rj1dm2lm351cuoq55ng/zakawe.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/19845084897.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/18606955908.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/8qfrm94ijt4maphil4q55smgn5/bofalinilalowa.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a46ab9e2aa---39438551681.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a38f6e0b9---57127260126.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b218276a609---kagimuxiborowojeleta.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/tpgdn50lvgvc3o53qhf3vnt1v6/pefarepugo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE794 9572 bytes
SHA-256: 46558ce18f277c673b8c94b2d78831ce1e30e346c58b9a6703e2fda2dee94815
font_01_sfnt_off0000fc56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11468 17896 bytes
SHA-256: d4d94e5d1de2263c89ddeb0907d5bd34187ac28407df4db648de1caecd2b39dc
font_03_sfnt_off0001426d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1426D 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd

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