Malicious PDF — malware analysis report

Static analysis result for SHA-256 440c3162dc89bf44…

MALICIOUS

PDF

97.0 KB Created: 2021-09-11 20:21:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8a4449f2d2d95197a0d447e0e8ddc670 SHA-1: 9165cd81ad0778363e4a63309466a8be6c183e26 SHA-256: 440c3162dc89bf4480f38566156edef3a7caabb5380fdbe8df93cbf3ae057650
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of embedded JavaScript points to its use in executing malicious actions or facilitating redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 7

  • 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.
  • 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://lexxyin.net/files/fckeditor/file/87907045738.pdf
    • http://phutungvespaco.com/luutru/files/zelofofewowusajonafoleral.pdf
    • http://ues-rb.ru/themes/ues-rb.ru/files/budufinexagakinu.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133dcd3b5ab8---85712258136.pdf
    • https://egyptsuntours.com/userfiles/files/59795941081.pdf
    • https://la-klamm.org/userfiles/file/defoxilebubagezokofir.pdf
    • https://investir-petroleo.pt/ckfinder/userfiles/files/47790748205.pdf
    • http://golfvillageonline.com/userfiles/file/46991266936.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16130fad1dbf79---kotolatuta.pdf
    • http://hoilhpnqbthanh.com/upload/file/96791120617.pdf
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/29714139523.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/3edd015984035b8497d7acab8fb7e3df/jikiwefutovulazagasuza.pdf
    • https://ratosatu.com/contents/files/69245967937.pdf
    • http://ktcyy.com/ckfinder/userfiles/files/gefukadorina.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/38e75cd18719886487d5bd89fe492217/18464846782.pdf
    • http://werder-ritter.de/UserFiles/File/binudemasofagopumekis.pdf
    • https://ivanda-commerce.hr/userfiles/file/larasisabaso.pdf
    • http://classicalgardenornaments.com/uplds/file/rogizur.pdf
    • http://modern-pro.ru/files/file/kizizudokumanagewulejeze.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133dfe044b12---safekuvajekerulov.pdf
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/27670875969.pdf
    • https://lenaoyunlar.com/calisma2/files/uploads/90836580713.pdf
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/74281364088.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=phone+cannot+read+sd+card
    • 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_off000115e0.bin
f6a903a443f01f2fdd09748fd495f03ca639b90639d82523b469e1eff86f850a
pdf-font-stream PDF embedded font (sfnt) at offset 0x115E0 10328 bytes
font_01_sfnt_off00012d27.bin
68a0f6f34859fadb0a9609908dba615af88e5bd046d1d3f3189f241b973bb2a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D27 18856 bytes
font_02_sfnt_off00015e00.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15E00 16792 bytes