Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ef3ea28ab4589d…

MALICIOUS

PDF

126.3 KB Created: 2021-07-17 22:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 475739e7f3473f6d65355e4b2648cfaf SHA-1: 8e52464f2918b5666f95de8a27957bf27a1bb6d2 SHA-256: 81ef3ea28ab4589da09772763918d2e1f031c7709b0a5c17ee3f40b7621036c3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on compromised websites, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://danangsculpture.com/uploads/image/files/sozeru.pdf In PDF document text
    • https://sardavetri.it/userfiles/file/gazinonopamakudu.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/e57cf77a1cd80ed5780bfc813c24bf45/wokesumuzizipot.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/sadedewogenivolitusok.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/9186834498.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c274784fc59---81337517948.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c8aed784f5c---kaladajudo.pdfIn PDF document text
    • https://ahha.az/userfiles/file/batumodufebod.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/404a0e5f23233fd8df24d23a266fd239/fezodimodekivej.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/wotigetirased.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/71ad0bbbfe63da3cad0bc8b3991a6129/4939219281.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/4e42d8c02cf6167f196c32b7c810c7cd/rukutufajamukulatajazu.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f004a65c553---lamasabu.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com//app/webroot/uploads/ckuploads/files/75586732536.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/56252ecee6dc8b5bc3bea3394bf09a49/80314517611.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c51901b5c7f---pafapanebuzuvabasuweraw.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/5d0c35b251b2afccf6676147c79e2875/40314162109.pdfIn PDF document text
    • http://rykatd.com/files/saxakikudifafel.pdfIn PDF document text
    • http://biomisszio.hu/tmp/92415792391.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/9caa4623451b62b4f48e9396408414f4/81341277335.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/f92405c220e05fd19ca803fbd2715407/vekevowizukafisuziwirafu.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160db7ee7c28ef---kanujabotabulabaporin.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/6c87148b707ac8a92b753885a204f49a/majevitemedika.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/316928cfd4a4f5b0f0a616d3c1b1160c/67613764118.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=a+noun+that+starts+with+nPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ed9a1daf1---87629894567.pdfIn PDF document text
    • 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_off00018f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001a7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A7B0 10192 bytes
SHA-256: 0c6ca620d28ce41c88ae5e1d41a44912ed8cca6ef0b3b0bcac404aa3a8ef1464
font_02_sfnt_off0001be8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE8F 17636 bytes
SHA-256: 5d75cfd8fd685f33ed93f4abc91309d2418eddb1d453bf7e21f0e57c6f30a0e2

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