Malicious PDF — malware analysis report

Static analysis result for SHA-256 0145b81643885814…

MALICIOUS

PDF

75.9 KB Created: 2021-08-18 20:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b02ef3652e9e7f75390d755a095c190b SHA-1: 331132f0475e01afbc4e74d73ec334a46b1cc789 SHA-256: 0145b81643885814ff52c544d2899f2cc2874bc8a85a0823452a9ef50df0e1af
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users into downloading further malicious content or visiting phishing sites. The embedded JavaScript is likely used to facilitate the redirection or download process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608a02d4190a4---22246016829.pdf
    • http://speed-r.com/js/upload/files/21087703328.pdf
    • http://riggi.ru/userfiles/file/1719636949.pdf
    • http://everest-c.ru/ckfinder/userfiles/files/zuzuzemuj.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4d89cecad---pideremo.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161127d0a8a91b---fipibevotojoxoki.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/rker2e8v1mbv48qerglk50o355/89477920151.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/e8f3e67a1c4309cdf3fa32d4d6555222/90674381976.pdf
    • https://tpk-m.ru/files/file/zusofiz.pdf
    • https://portalbime.com/UploadedFiles/New/file/10943155403.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db17b04d781---59350862424.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/62d1f3487e5abcc84b760411b7ee0bde/butewuxevizelo.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/931cb7114dd650424a944d8ce8a0f487/17958532537.pdf
    • https://tailormade-sales-marketing.com/userfiles/file/45215087005.pdf
    • http://mazdooradda.com/userfiles/file/99942208476.pdf
    • https://unosms.us/userfiles/file/diwezeduki.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb4cff3fea4---55679258761.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160faf9af3bd3b---gukidaxi.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbccb20554---tepuzelud.pdf
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/e859a114d896a3e6ef1bed6a99a3cce8/retenelebopatov.pdf
    • http://www.bandungmesin.com/file/67020872225.pdf
    • https://cafesca.mx/ckfinder/userfiles/files/33218608550.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078284d0ff57---31803840542.pdf
    • https://bandotrading.com/uploads/file/83080738492.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=los+trigales+voceros+de+cristo+mp3
    • 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_off0000c286.bin
0e37413a2c25558c5992220beb78b291cb6c3e06e211bed25f59c0358cb14191
pdf-font-stream PDF embedded font (sfnt) at offset 0xC286 17540 bytes
font_01_sfnt_off0000ef38.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF38 16792 bytes
font_02_sfnt_off0001074f.bin
4929d519f08e16edc50068632572f4ae47d344797bc79179aaf512f859e13b05
pdf-font-stream PDF embedded font (sfnt) at offset 0x1074F 10948 bytes