Malicious PDF — malware analysis report

Static analysis result for SHA-256 558f6a4b00294a18…

MALICIOUS

PDF

79.4 KB Created: 2021-07-04 01:54:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a0f1ffcede19ad015ef8bc83d4dd4abe SHA-1: 7b6e887ee9b34c27807567eaf676c4aa2877a81d SHA-256: 558f6a4b00294a1856d7c659a8daa0ec53dd6cd92aa6e8d3d251374014f3bf02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of external links, many of which point to websites hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern observed is the use of a link farm to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://mytekas.com/UserFiles/file/doxodupevowele.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e4a9dba95---62253400094.pdf
    • http://live-lessons.net/lcj/web/uploads/assets/file/92588035754.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/nd0onfqhrpp55mu6p3m0v2etpq/mevixu.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070366e646ef---96443969341.pdf
    • https://istanbulbalbir.com/upload/ckfinder/files/pabitibubikow.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b902b68452c---1270170738.pdf
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/19280666e0e4ad6f8a1281c6552cafcd/1766249292.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/b3tu1iqlt0rteqkgrts6bbedbb/32207525059.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/10695860705.pdf
    • http://nkcophs50threunion.com/clients/0/01/014062e559e26c1cf0711bcec4e573ae/File/70713626702.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/74def4e02e38c5b671f28a177a70bf2f/42872780567.pdf
    • http://kolasinprevoz.rs/slike/files/navosa.pdf
    • http://clarksville.net/wysiwygfiles/file/7170035135.pdf
    • https://textolinguisticsolutions.com/upload/editor/file/jawanisefipamos.pdf
    • http://www.chatanakonci.cz/userfiles/file/82067061230.pdf
    • http://urbanconstructions.org/images/uploadedimages/file/jejejer.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160849f69c58d0---lolorogamodolupo.pdf
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/45487900325.pdf
    • http://teifsepahan.com/files/file/52936780629.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087fa743e2eb---49374101865.pdf
    • https://agrimal.pl/userfiles/file/daxifatas.pdf
    • https://lacecinella.com/writable/public/userfiles/file/gijurejofuluxukufototez.pdf
    • http://sillajen.com/fckeditor/_upload/file/sosapibobun.pdf
    • http://aqbnb.com/uploadfile/file/51671434590.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=plus+and+minus+sums+for+grade+3
    • 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_off0000d4d4.bin
561bdd4833db2c06f67eefa820a467526fe11c57a9b10f813cedf0df7effd95a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D4 16320 bytes
font_01_sfnt_off0000ff4e.bin
fd709c6d0a8df52aad5fa4e13203d136b6bd9179f58bf2478c71ff9b16ab4212
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4E 10872 bytes
font_02_sfnt_off00011831.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11831 16792 bytes