Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c3d696fe2ed64e4…

MALICIOUS

PDF

69.3 KB Created: 2021-09-08 05:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5c286a4ccf7c6ee444499a3c83be7d92 SHA-1: d0d0903b8e969016c09904703f7eb72d7dc1118d SHA-256: 1c3d696fe2ed64e46bc1746bc2716e0844299991fb0ff2b8c20934414cef18d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. These URLs are likely used to host phishing pages or further malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/d8cm8aphhnmku95k8813ko6fjd/40068215014.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/4e43026e5af6bbeb0edd91320cb566f4/88678393286.pdf
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/67167159578.pdf
    • http://dogable.de/userfiles/file/valulunejigoxazanilegol.pdf
    • http://www.520amis.com/upload/files/17970789728.pdf
    • http://a-kamen.com/userfiles/file/92933765835.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/ulbejfsqdompjelkoih9imvq6e/91208520266.pdf
    • http://voijin.com/userfiles/files/vatusararovudibefomekoka.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4707a7750d---35454239243.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4d260dca9---lokufoga.pdf
    • http://kcntanduc.vn/img_duhoc/files/24927684762.pdf
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c2643dc83eb---1631221910.pdf
    • http://kingalbertltd.com/uploadedfiles/file/lavadaromemipedisabo.pdf
    • http://dejede.com/userfiles/file/97362170188.pdf
    • http://odnoklassniki-files.ru/images/uploads/files/gijakojedalodixajisa.pdf
    • http://bjjiffy.com/upload/70413073533.pdf
    • http://childhood-matters.com/clients/49507/File/36389795243.pdf
    • https://ww150005.linebot.net/upfile/files/20210905141725.pdf
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/64066710391.pdf
    • http://ttccid.com/userfiles/file/jipil.pdf
    • http://kojeneckezbozi.eu/userfiles/file/82419768531.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=ks3+inequalities+worksheet+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad92.bin
63765a842ec2e7fd04bb7ee650beeff3cc35369638fd86bf2e104ff5960ae2ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD92 11180 bytes
font_01_sfnt_off0000c78a.bin
19ecc565d53412fc643c9a8824af846787b759660e196deb78a62c43db40a472		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC78A 16048 bytes
font_02_sfnt_off0000f03f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF03F 16792 bytes

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