Malicious PDF — malware analysis report

Static analysis result for SHA-256 cde52553a8644697…

MALICIOUS

PDF

92.6 KB Created: 2021-07-06 03:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 24002a1f45e41ebcc6a1aaddf7479505 SHA-1: 75290a1e0eb6b17a12f3112e027b574e628b5547 SHA-256: cde52553a864469716419a55dd2a4e06a64323bae73f80fd04bc6b2b8d9f61db
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e551bc1cdb---43932167192.pdf In PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884a71e774f---28279457641.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6f276b5e1---pexufuzun.pdfIn PDF document text
    • https://cristalensi.com/public/File/93732152923.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/fb9238f68a2f9a633781861a73a35b38/75544811411.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607accfbc3978---17657722922.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/3dbda11ac873d34382cb276aa0e7ec74/79789833327.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210615161831.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/8s5lnqpehi33hmjuq3te91uim1/bokofoxi.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/g2ag4m5hvushs00q5s92qh9gq2/jefapugipesovelumegirutar.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/8f15a9a73a422615b00d7cd432a6357b/97449087734.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents//files/19780787079.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/57348847206.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/90994792356.pdfIn PDF document text
    • http://samtle.net/ckupload/files/68558096479.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///motofupejurevutu.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/73602894530.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/bosifudisazatixuxirodo.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/46724234823.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/saxamopanat.pdfIn PDF document text
    • https://medius.sk/userfiles/file/xutesanafusilajurutewuwo.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/c3a93c3adfab4e19543c66bd3e4d03f8/21876342243.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=the+migration+of+judahPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CF 16684 bytes
SHA-256: 607530fdb70c372c6acaa8f518f23ff43306149cc0ef82d59646f69d1d6e0b9d
font_01_sfnt_off00013515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13515 10780 bytes
SHA-256: 6c19b86b0ebb0a10148c6ed92e1f63d5aeb9951387d456024f704943a67872c0
font_02_sfnt_off00014d74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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