Malicious PDF — malware analysis report

Static analysis result for SHA-256 379be7e5c90e6a27…

MALICIOUS

PDF

97.1 KB Created: 2021-07-25 06:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0300961e0f116aa634165ebddee6aeb4 SHA-1: 91fb299b9be7c5501fda98b88214d0018662db71 SHA-256: 379be7e5c90e6a27aa4f9f2302319275694eb133ea949715d514e7d60c407ab0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to various compromised WordPress upload storage locations and disposable hosting, suggesting an attempt to distribute malicious content or phish users. Although no scripts were extracted, the presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078571a7258e---47633991844.pdf
    • http://bajajsports.com/userfiles/file/927375617.pdf
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/f7a305435909e36c222226aff427f69b/dijuner.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/jikorefutuneteno.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/ee30bc51f41bce5ec4ef018857453059/53222358247.pdf
    • http://baugeraeteverleih.de/benutzerdateien/26680607803.pdf
    • https://licorne-hotel-restaurant.com/userfiles/file/955940845.pdf
    • http://honda-vo.com/upload/file/watabitubozugazun.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/aeff4f8aaab9ca5b18430d4d70823d2f/nopewedivupetikuzejafi.pdf
    • http://bjjiffy.com/upload/77674966135.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/3talhhd4onkan2ln2uger8tsls/jibur.pdf
    • http://kstarsmall.net/userfiles/file///lotunewu.pdf
    • https://doctmcooper.com/userfiles/files/13250486901.pdf
    • http://provia-events.de/pics/fotos/1/file/69692657447.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e53202417---laropotowebosudimupal.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/1ch0hvp03tj2jdmcjulhdvi4t2/38139238118.pdf
    • http://futuralagoparking.eu/userfiles/files/97842043917.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/8ac53be5f60ebfd5a562a9a7b0d7012f/lusajunip.pdf
    • http://koala-al.com/d/files/83423129269.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ec5a44dab---83155155637.pdf
    • https://hgb.se/filer/file/36682851570.pdf
    • https://educhina.mn/editor/files/28044470197.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=ph%E1%BA%A7n+m%E1%BB%81m+chuy%E1%BB%83n+%C4%91u%C3%B4i+pdf+sang+jpg
    • 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_off0000eddf.bin
1d50268df795a8c038e3f1717ec062e1f52c70fa2057f7d87f98b9ee4688f31b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDF 11848 bytes
font_01_sfnt_off000108b2.bin
8b0e148336dc96c56fdee1b2a13819dc7570f074df530e961c32eee02a9318f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x108B2 30116 bytes
font_02_sfnt_off0001442a.bin
d0efbf5423116de0f68c7e0cfea9d736d276139d4301749e393c96a521932b54
pdf-font-stream PDF embedded font (sfnt) at offset 0x1442A 16628 bytes
font_03_sfnt_off00015aa4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15AA4 16792 bytes