Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e15c87eaa30fc5b…

MALICIOUS

PDF

85.4 KB Created: 2021-08-20 00:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3d4ce497b64576cab44234711644284d SHA-1: b39d2455d9157299cdd5ca354e127f838ee5475a SHA-256: 3e15c87eaa30fc5bbf32d5e4c28243c418185075258c7754ff4f0fb690475305
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS uploads or appear to be disposable. This suggests the document is designed to lure users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://highlandcougars83.com/clients/2/26/268573c5102cd00412bac87cee9346ec/File/4158369575.pdf In PDF document text
    • http://askort.pl/Upload/file/92956245707.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/pikifijafasa.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160765751f304e---56135549131.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/74534754078.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/zeguvasa.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607592ab3579b---nifaxomoxufosije.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/87861064c6f96e13d7431a9502d6e71c/pogokokutesadufebolo.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/wolegisuxinevuvudotozekox.pdfIn PDF document text
    • http://faradbox.pl/files/file/84728506002.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16099de3d329f0---nozurububugiro.pdfIn PDF document text
    • http://stromzeleny.cz/file/kimesesok.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/xejiluramigiko.pdfIn PDF document text
    • http://bjjiffy.com/upload/11736147542.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/wunoperowowedobibogebik.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a229c99cd65---61224459171.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/agioh2ii7a6d13h6amr2a4v5p2/rivisutarilog.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/zujuzisefanubozu.pdfIn PDF document text
    • http://hillandcunnreunion.com/clients/864369/File/1294201648.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/84271749914.pdfIn PDF document text
    • http://jentretiens.ch/uploadimage/xesamilonoxubunuvodijefuz.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/27121952656.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/860ca4c3c0381cc2d7212a58a3ca48d2/xenivujoxegududepug.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/gg4crm6a4524q4qnisq8hh0pl6/wokojanadexotituvokaz.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608b56789954c---somozinoji.pdfIn PDF document text
    • http://abington1964.com/clients/865474/File/guminurojurok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=por+que+las+bases+nitrogenadas+son+complementariasPDF 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_off0000e96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96E 11244 bytes
SHA-256: 3f11f1dea988b2936591513b4ba8418fc53c8d7e22e21339a7f37dbf3b52c4af
font_01_sfnt_off00010311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10311 16848 bytes
SHA-256: 1c4725962a0b7de1a280ed0161464c0476d6c24f000810d584acc67d4100beb8
font_02_sfnt_off00012d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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