Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa694fa622394c0a…

MALICIOUS

PDF

72.3 KB Created: 2021-09-27 01:33:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d16353c99b6a4c3507f9ed9b2a311cdc SHA-1: cdd8eb7cc3319f5a0d69be205dbf4328a2a2e166 SHA-256: aa694fa622394c0aad25abc55f620f786ebb3bad0f49c27b08f8c66f63acc914
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://salocchi.it/userfiles/files/96477702175.pdf In PDF document text
    • https://seikai.jp/free_images/files/73962725919.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614828c302ff3---zawulalisugoxokavatavezu.pdfIn PDF document text
    • http://otohyundaidanang.com/uploads/image/files/95544531220.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/1fb793ddaa2254a7e1340f7fab2c8f28/dobeweruv.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/59493833367.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29656371648.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/derumodakopidabonudix.pdfIn PDF document text
    • https://tamphuctriland.vn/upload/files/merolulokax.pdfIn PDF document text
    • http://schokozentrale.de/idata/tavizivabusegikepi.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021092312475835.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/85868527240.pdfIn PDF document text
    • https://sassanoproperties.com/FCKeditor/file/mexawateb.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/23993681555.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/kekot.pdfIn PDF document text
    • http://apvn.info/userfiles/file/21040491207.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/13496695009.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/xumiwedofizoro.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1614de77a56143---87018730171.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/415136885.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/b27cb6c3e7ef24dc50272a4afa6df727/dowapilebakedinifemuvoxax.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202109031030318942.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/38836207537.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142858d56c34---84922360736.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/49928240520.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/92582351607.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/xebozemevovi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=most+modern+transaction+processing+systems+usePDF 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_off0000b526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB526 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD38 16812 bytes
SHA-256: 3205cd757e7d2bf033ed7b1ac3af59dcb655ea52911577040f058fb3fd866673
font_02_sfnt_off0000f7e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E6 11020 bytes
SHA-256: 046b4e3889ccd4577f5ffab29468651e11a57f3241291b1d1ed348a19817b2d8

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