Malicious PDF — malware analysis report

Static analysis result for SHA-256 225639f2ed7fcaa2…

MALICIOUS

PDF

101.5 KB Created: 2021-06-29 19:38:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 22ef694d16d846ec988e675c0fd349ba SHA-1: e5309b0a4c5c93cfe5a26a6a57b19b3a9eea6d09 SHA-256: 225639f2ed7fcaa2163509c96c87c571439979f03e420748c7289a4c047badd8
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites. The embedded URLs and the nature of the heuristics strongly suggest an intent to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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 http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/91951276043.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/5c4083395a18213b9de903a43ea6546f/dinotebafovubukoto.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/e0ceb1359317cc2c79b2966214d65498/76917446272.pdf
    • https://jurad.eu/files/file/10047199163.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074baa7dff64---45761518894.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd6d6a8d99---lepikumagozot.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/e133c4dd52395b1569eb1b6c81ff0e01/viwimiwanukatibifoj.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/nne3fd1cav1gafbroqpht54qk1/20279039843.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072e72e39cd5---11177978938.pdf
    • http://taxicityplus.ru/userfiles/file/datuzolajanin.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce41aa10a1---44597724707.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708e0d8edb7---53464832480.pdf
    • https://badoza.net/userfiles/file/xunikolive.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/fb24645b96ed494463f86de3d8cab937/wovitumitexejomuragi.pdf
    • https://condominiobrisasdelnorte.com/userfiles/file/taguxiwupusigakeralusatez.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/2eaa8f8d4f9ddcc3bf1ebb61f753eeef/pemojekizuwasefitevasafi.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/d5abe3893d9d19b93f7033548ae2d26a/gakuxidonumilovuki.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/9c41489afe0c77b581d16af1b5cf37b6/dejadobojipinogejewute.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b4fd57549---80125685005.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ec5db704d---7288911367.pdf
    • http://naplesredeals.com/userfiles/files/59993387294.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/d6ht65cnbkeb0jv6adeso91nhk/tamivalaxunorene.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/c83eb32e233d14c95d9f7ce36bbe9711/bunavasemukudo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=area+of+a+scalene+triangle+given+3+sides
    • 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_off00010c81.bin
d06246de5fbca08a8e71b3266423534d5cc020e17a1f81eafc946de7058d617f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C81 16088 bytes
font_01_sfnt_off000121b7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121B7 16792 bytes
font_02_sfnt_off000139c9.bin
2a0bdc9fb39f03d29a19ab941f56055c598dfbe82a230f1fb27d6ad4154f2a72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139C9 19328 bytes
font_03_sfnt_off00016d61.bin
914ddc512804542e45f0dcae3091535312b34e564bf241aaff74e83b796b14b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16D61 10872 bytes

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