Malicious PDF — malware analysis report

Static analysis result for SHA-256 089af23be3c4dce7…

MALICIOUS

PDF

75.3 KB Created: 2021-09-24 05:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cb668c64562c15d43579cbc0686a018f SHA-1: a32cb26d65fe5a232b6750a32be77245bca93219 SHA-256: 089af23be3c4dce7b3073c18b6bbb7639ff0b160063625c12542c368f4614354
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs that form a link farm, with several pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to lure users into downloading further malicious content or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.europesolidaire.eu/userfiles/files/safabutelovezigo.pdf
    • http://faptvmedia.com/userfiles/file/mojijabuzaf.pdf
    • https://bmw-zona.ru/uploads/file/57808475828.pdf
    • https://alate.org/admin/fckeditor/editorfile/40860369444.pdf
    • https://balticseaheritage.com/res/wysiwyg/file/84634418625.pdf
    • http://jafra-com.at/userfiles/file/rotusur.pdf
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/69035360605.pdf
    • http://tandprotheses.com/ckfinder/userfiles/files/tasijosabitofilofebaran.pdf
    • https://baohohoanglong.com/userfiles/file/23234705616.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16148c25a300e0---tezuwo.pdf
    • https://hzautomatisering.nl/userfiles/file/20116793636.pdf
    • https://ibshospitals.com/userfiles/file/27930059840.pdf
    • https://marblobathware.com/app/webroot/img/files/razojowij.pdf
    • http://win-sonic.com/ck_imgs/files/60037142136.pdf
    • http://chinawin-consult.com/userfiles/kokufotig.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/cbe35ff7d23e8cdad7b82e12aa54799e/bivilon.pdf
    • http://chineseclothingonline.net/File/97331210075.pdf
    • http://sity-luxe.ru/userfiles/file/lexopapa.pdf
    • http://sun-green.de/ckfinder/userfiles/files/nobifobopofejaleselixu.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16130b258a67bc---30668697790.pdf
    • https://matratva.in/userfiles/file/74645223120.pdf
    • http://alphanaturehk.com/userfiles/file/fubufagufazilafedujozan.pdf
    • http://galenbio.com/images/upload/file/88778095925.pdf
    • https://fratellifurloni.it/file/ziburabox.pdf
    • http://zhuxintrading.com/uploads/ckfinder/files/20210911/16313685415574.pdf
    • http://cellesekorea.com/ckupload/files/jalufupiwulezi.pdf
    • http://pm-ural.com/uploads/files/dozipewulekoxobetirilozes.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=nastaleeq+font+android
    • 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_off0000c5cd.bin
214418332dfc3e9b6fc002692d9d51c594038886953d233782bb0abd4e2abcd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CD 16472 bytes
font_01_sfnt_off0000f037.bin
3053c607ee1e0db6e16544f394d5a7d09d3659484ec14c040aa03f1e8c5ebbf0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF037 10468 bytes
font_02_sfnt_off000107e0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107E0 16792 bytes

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