Malicious PDF — malware analysis report

Static analysis result for SHA-256 a86cc5852ecd7ce6…

MALICIOUS

PDF

93.6 KB Created: 2021-08-12 16:11:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cd9a66e838db416e8f78c9d50d53f28e SHA-1: 73a92f53f6923add6889bec8841dbbc158a1952b SHA-256: a86cc5852ecd7ce60b96ae6966667bf4d660d952e2bc89cceccae082924cbf6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of a link farm pointing to compromised WordPress upload directories, suggesting an attempt to lure users to malicious or phishing content. The document body is heavily obfuscated and unreadable, providing no further context on its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/436c34f9cbd8a8e5f533eef20c67b7d6/wonotufugoluji.pdf In PDF document text
    • http://feynburg-uhren.de/uploads/doboroloninofakurijulunet.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/d5d581e76569a0046ce186cfaffbe900/77436993921.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/kufimonurazasuxemo.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/51734482609.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/12906449355.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/27199147197.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c93c1f85265---33283339618.pdfIn PDF document text
    • http://nrnchina.com/test/images/ckfinder/files/22402966016.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/5847e20e1b3402c0649b8666034bbf28/10618596581.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/61762845141.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ee9209019c1---domesomagujun.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/71312353920.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608953ae4c977---3913429771.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/dununepitozutu.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/4586303298.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/nukizokivasav.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608018c76773e---20219676905.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021070202005329.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/18841913979.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/0020c069d707fe05aeaf7f1046488ac8/redinolidikagi.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/99658034162.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/25979919920.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=%C3%A9valuation+orthographe+son+s+ce2PDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA60 10936 bytes
SHA-256: 42330834704d32e0d4bbdb19f06da685ad67e390d1010fc34a2f28569c84f8d8
font_01_sfnt_off000103c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD5 16684 bytes
SHA-256: 0b66887e43cc35630d0970669c797ecfbf492bb097841a83f6681a0f5b87338d
font_03_sfnt_off000132cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132CC 20136 bytes
SHA-256: ebd56653632a7b813c98dd0e88e38183129c81b6aa40dcfe9fbe0ab3ad7cbdb8

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