Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c2354aeeeff86f9…

MALICIOUS

PDF

78.2 KB Created: 2021-08-27 21:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: da421cfa4e4d9b2f085fc6a34a34a1ab SHA-1: fcfeaf96269840eb47889a55b0178ff71be8e1b7 SHA-256: 7c2354aeeeff86f97b3e04e3c671517401b8f3568aa9a8dea105bb4daec7c030
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected by ML classifiers and ClamAV as malicious. It functions as a link farm, directing users to multiple potentially compromised websites, indicated by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The primary goal appears to be redirecting users to external resources, likely for phishing or further malware delivery, rather than containing an embedded exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://j1medical.com/uploaded/file/lowepisujojizifilerajaru.pdf In PDF document text
    • http://yongqingtech.com/d/files/mixodewofogu.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608143a695e6a---57879606399.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/14692869296.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c511dc1b659---kudukomavuvipubigezanuram.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609415c4e9f96---51622013605.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608e756119e00---jipidaminipemadedazuvof.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/88468994348.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/m6blr7jq73s33atcai9uq6uoao/vubudizutokukiruta.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/96076591507.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/mekidesamolilexumo.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5d2d514ae---98160426212.pdfIn PDF document text
    • http://jwconsult2005.com/file_media/file_image/file/6338488716.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/86464995875.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/fosuworaxovedixel.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/52792140193.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/gorujukomosakapidav.pdfIn PDF document text
    • http://skyline1968.com/clients/74864/File/20805172432.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e1cfb9991---fenajederifidoti.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2080ab22ea---xigulunawasuzepu.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/mugogezonasabuw.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/15242119850.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/towodifumiw.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0afdecc029---30102863380.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=ayo+and+teo+last+forever+dancePDF 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_off0000c5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dde6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE6 10540 bytes
SHA-256: 07d7a360193f23e6546fa3e7dac6a4ac225cb0b78378d13032b5e3a6c17ff10a
font_02_sfnt_off0000f626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF626 18864 bytes
SHA-256: 55587573281181c9a7eb186e67ae94e33514943b5846f767111eeca11eb17f90

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