Malicious PDF — malware analysis report

Static analysis result for SHA-256 85cc6d8a1f202384…

MALICIOUS

PDF

92.7 KB Created: 2021-06-28 01:59:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6a5719d62e143886239b981b0dd43d56 SHA-1: 100a64aead2804f07d7fe3dfa8a6b40acfb7e879 SHA-256: 85cc6d8a1f2023848ae35ba50583a30c22e7d9526a326c26e0ac776d43b5308d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, suggesting an attempt to lure users to potentially harmful content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4cae57494e---pogamudivab.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f43cd04cd---68256652769.pdf
    • http://healthywithhart.com/res/file/ximeviguvulebugemaxanu.pdf
    • http://arcenevents.nl/site/upload/files/taxukezukefarojavefubiz.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/i5u9o02q6ulm66iuaj57v28ram/zunerakunoguxeduxode.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785800c31d1---93689654085.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/d6v8glmqvc564c0vbnu148ftpu/zapovividoxojusipovikowib.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160872be3d6502---6247824839.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16084798883b97---puwelotojedix.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/60d32334a29e3ad335bd4e947b169703/koxelunuvaxevitinorew.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/a0cd71dd00f53433d6a1aee7aacd1578/nosuxew.pdf
    • https://cr2tek.com/userfiles/Proj_Name//files/51741573579.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/33m1f4k6lri4c1e4ht0jgs3m6q/femunibegudekejewa.pdf
    • https://nhachoxebus.com/upload/fck/file/36588285543.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/10spikh00oqu60r67gbia67ae2/97815085705.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2bfb214893---50005317646.pdf
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/49920807253.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160884405f2cae---26853995279.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4b9895186---25878951960.pdf
    • https://workinhotel.com/upload/fckfile/74552387681.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/8885da4f378e4e21ca246daa4f935c6f/vuwutilusaj.pdf
    • http://www.tobywells.org/media/fckdir/file/70149570812.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/18b9a2e9755845e951bb9c22bbaf0c2a/kobisesorojofegutavik.pdf
    • https://watertorens.nl/userfiles/file/sigorepubutelumarekojax.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=agreement+letter+sample+between+two+parties
    • 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_off0000f45f.bin
2286d9d309b82d68217160cf7ce2b01bb068dae87b38ee4cd91ceec49e4e5a4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF45F 10800 bytes
font_01_sfnt_off00010d14.bin
88c3ff3d504fe21396ccf86ead62385fb5b1a741cd69e9a1c2d5162dfb3a7578		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D14 16348 bytes
font_02_sfnt_off0001376e.bin
c9fa871d706934500ba7362bcc2679cd089fe7f1d29a584b92b55675ed6be739		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1376E 16080 bytes
font_03_sfnt_off00014c96.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C96 16792 bytes

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