Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f0a46dd42a47c25…

MALICIOUS

PDF

85.7 KB Created: 2021-09-18 04:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8441d4252ccb445f470b77b53d78be2f SHA-1: a6b90e788669b011d8e0ed7d65656e1feaee8efb SHA-256: 4f0a46dd42a47c251ec4a5943b339020565a9fed2ccbdeefde802e6e37351f1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many embedded URLs pointing to various domains, some of which are hosted on compromised CMS uploads. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://taiwanglassgroup.cn/userfiles/file/jeriworuk.pdf
    • https://cmf8.ir/data/file/tazonemivo.pdf
    • http://articolo17.it/siti/usr/foto/files/45947263772.pdf
    • http://samtle.net/ckupload/files/laxojexafom.pdf
    • https://alubiasdetolosa.com/files/galeria/files/70869830155.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136a176808c3---suxebeket.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/f0af987cf368a3d27ebe4a2b2a2bf51c/16997692216.pdf
    • http://lynxauto.ru/userfiles/file/72756234004.pdf
    • http://laptopplus.be/app/webroot/files/userfiles/files/59354968637.pdf
    • https://stop-remont.ru/ckfinder/userfiles/files/1919816758.pdf
    • http://lutechmed.com/Images_upload/files/dixizuruwopuga.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161414e6f3f154---kifazorof.pdf
    • http://tercovci.cz/files/file/lufirotili.pdf
    • https://procogs.com/FCKeditor/file/27972227748.pdf
    • http://hoya889.com/upfile/files/20210903105834.pdf
    • http://dvg.asia/ckfinder/uploadfiles/files/74599161433.pdf
    • http://avandcie-energy.com/ckfinder/userfiles/files/kotewuzosabima.pdf
    • http://gazetavk.ru/img/file/xevebulifez.pdf
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/vuzabadudowafutitofufaxop.pdf
    • https://hiroyoung.com/data/files/56443386181.pdf
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/tokixesanazonojej.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=past+perfect+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cac8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC8 16792 bytes
font_01_sfnt_off0000e2df.bin
212a3d6a9e180dfd7b9fe88ef70fa5061cc8f56b7451e533d1945daa7299a379		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DF 10252 bytes
font_02_sfnt_off0000fa0f.bin
861a15360a9448029101faf65c0e6437a9502b75b909e5f5ed6e4fe278ad8a02		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0F 22640 bytes
font_03_sfnt_off000133a6.bin
b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133A6 16148 bytes

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