Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9aa3fe1b88f0710…

MALICIOUS

PDF

96.9 KB Created: 2021-06-29 00:08:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 750ba30893e0753203b5d50dfb2535bd SHA-1: c4cd250d07e7dfc28ed7beda49e45f957b98187a SHA-256: d9aa3fe1b88f071033286032f7562adb45851d01dc2f298d07890dc002a4fe1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farms points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/57d0b1834b5e62ed247da6f4e572e179/lovikekaxulutusofiwula.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/8a9bec4930b0a7bf8a190846043ed9c4/dolilev.pdf
    • https://baigiangtoanhoc.com/upload/files/nofatedofenudasuj.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/7c7b4c1a8f3f85e16cfe725e3b129986/50323291983.pdf
    • http://diamondsnspurs.com/clients/12200/File/mizubavezegirizelubuw.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a65e05d5800---demerabujuzum.pdf
    • http://apartmaji-zunicmile.com/uporabnik/file/47200726525.pdf
    • http://domeinbeverdonk.be/assets/files/file/82773944777.pdf
    • https://giolog.biz/images/bulk_images/files/98185927163.pdf
    • http://nktrading.qa/file/files/bisugatosi.pdf
    • http://zamokugrofa.sk/admin/fckeditor/file/69406530110.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/18lnm107396vf25dl9e40bo19s/siruvadut.pdf
    • http://acril.ru/ufiles/files/88735314315.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ac4e99eb0---2024798482.pdf
    • http://beloezoloto.ru/userfiles/file/10444519522.pdf
    • https://hostingyuvasi.com/calisma2/files/uploads/91826064265.pdf
    • https://sensorservice.org/userfiles/file/wafebekonom.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/gnp6djsar2p88f8ei5q2dks0e3/7755315750.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/bab8c874740cf15c678798b592569651/zitaxorirogowetob.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745a153bb1f---gureravajilames.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b6d5847de---34176481065.pdf
    • https://sinhadventure.com/uploads/file/kovaj.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/0e548nbsst2hhnv657kc4d7gb4/38096114370.pdf
    • http://elsekmont.eu/userfiles/file/babenuxegogawifodofizusa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=9th+class+physics+numericals+solved+chapter+4+pdf
    • 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_off00011448.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11448 16792 bytes
font_01_sfnt_off00012c5f.bin
842a455f9a75fe55b421b2dd3e5c0c3a858b5b7941617d8c108c60ebbb3f71c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5F 11316 bytes
font_02_sfnt_off000146da.bin
712f7c0c05d0d564f1509f3f87d76bb2fbcce8ba0d3f30ccd0a4708ea5503103
pdf-font-stream PDF embedded font (sfnt) at offset 0x146DA 17840 bytes