Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac4ef617152e4bd9…

MALICIOUS

PDF

82.7 KB Created: 2021-09-16 00:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9600fc16202fd1ce210d324b16fa70eb SHA-1: 12ab2200f6b0a2805a3a8d9228c88d6b9e33e676 SHA-256: ac4ef617152e4bd9521da5fdd677621baaf70c05acf6fb5218b58963d7e61e15
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a deliberate attempt to create a link farm for SEO manipulation or to host malicious content. The embedded JavaScript likely facilitates the redirection to these malicious sites, contributing to a phishing or malware distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://medvor.ru/uplcv?utm_term=minecraft+classic+to+play PDF link annotation
    • http://www.jindatunnel.com/up_files/file/mumazarolinudupigoj.pdfIn PDF document text
    • https://fix2go.info/userfiles/file/1317714766.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/desapaji.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c1d1d40ec---mojipaluzideturi.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/susepidetilin.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/23aad014813dd7715d5ddd6b8b08f5da/vupop.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161425f3b1c385---42515833187.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/narusine.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/1385937958614030957699e.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/sejezedixeg.pdfIn PDF document text
    • http://zerosquareonline.com/file/30401200721.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/zuvela.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/pawozixirisarajovudeza.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/jawexezewilinidetal.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/41422060234.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/46546362304.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/29102675416.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/tafokawilodog.pdfIn PDF document text
    • https://apgr.eu/UserFiles/file/19610989003.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/donaw.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/wopimuvupokozisi.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f9930e5d6---61397050962.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/bumakizefafevufozifiv.pdfIn PDF document text
    • http://newgoodluckcrane.com/admin/uploadfiles/file/76476023363.pdfIn PDF document text
    • http://www.moyekolodin.com/files/bewikuwiruxevaz.pdfIn PDF document text
    • http://www.cst.rnu.tn/js/ckfinder/userfiles/files/sazamasevozesogelole.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_off0000df96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF96 17404 bytes
SHA-256: 860e94f83bc7e903f50f55a88b2004731c6748c721b32255de622e00d0df10a0
font_01_sfnt_off00010cd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EF 10580 bytes
SHA-256: 5de993e73f29aecdd98682ee650de5d53867d98bd2f697feb224737af4a047cc

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