Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e71dc1ac2dd513…

MALICIOUS

PDF

84.5 KB Created: 2021-09-05 23:02:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dd5d2aa5fc4c0169b683cf14e62a40bc SHA-1: fd5b046a55fe235ef1e12689883d0f1312ee6611 SHA-256: 88e71dc1ac2dd51368667788d99c5539ffe2b59c8a0d4aac6b0c7eb0d50965c6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users into clicking malicious links, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cainghienbinhduong.com/uploads/userfiles/file/lomovasulibutemujogo.pdf
    • http://wojno-stal.pl/pliki/file/21524067080.pdf
    • http://jongauger.com/userfiles/file/wejaforuw.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ad99e91f35e---fufakituxulusurijofup.pdf
    • http://ttlh.vn/storage/ckfinder/files/korabomifefavemowajixagu.pdf
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/19646616495.pdf
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/72001961885.pdf
    • http://www.urbanwaterways.info/files/tarurizudawazexagemozofud.pdf
    • http://iraneto.com/basefile/iranetocom/files/36369988454.pdf
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/zepubewovagexu.pdf
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210717220353.pdf
    • https://atlaskvartir.ua/data/uploads/files/fepipinunov.pdf
    • http://sevenseahotel.com/uploads/images/files/nitivexudekaloros.pdf
    • http://se-ty.ru/uploads/userfiles/file/zurufuvugokovebov.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/fc6qi83vk4citacm46171tj6hf/53712472170.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/574687672664673b6f4d6fcac4cd55b6/rajuwososinuporuze.pdf
    • http://ferramentabelleggia.it/public/file/66835888388.pdf
    • https://mvmdigital.gr/files/files/pirunijomidotegidan.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/46pm1hega4pr11rcb6k7kdfhn6/28690439626.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607de12d85423---jovibopozevafub.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16096f5034edd4---xetuvozodomugozejezodelan.pdf
    • https://audreyheselmans.com/_files/file/12187599540.pdf
    • http://drairtools.com/ckfinder/userfiles/files/mogirutoziwepagike.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/bhocpgp3gdkjhavnoicmp1ssqd/bomobori.pdf
    • http://dytac.hk/userfiles/22922550535.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=marathon+watch+wr50m+user+manual
    • 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_off0000e4d8.bin
636efc6efecc2398b1947179d556be24ac9ee93b871c27e7eb2a42e880cc576e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D8 17748 bytes
font_01_sfnt_off0001130d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1130D 16792 bytes
font_02_sfnt_off00012b24.bin
0beb3f3fd43ab85b045b4ed8220b79eb9fe642066b0d6741334ab42fe0f12d80
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B24 10840 bytes