Malicious PDF — malware analysis report

Static analysis result for SHA-256 a69bcb71c2e29374…

MALICIOUS

PDF

92.4 KB Created: 2021-07-19 22:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a955f187c433ea939f3c5326d63f256a SHA-1: 0c8550162f01b86dbe912ae18c8ed313d73464da SHA-256: a69bcb71c2e293746b1cb86ecdbee313a5e4e92bdb52b6537246c3f566a15daf
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. This structure suggests a link farm designed to distribute malicious content, likely for phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160abe3afcc0c9---sugini.pdf In PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/betawajege.pdfIn PDF document text
    • https://realschoolspirit.net/scauserfiles/files/94293274477.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/35917edb178ab05a1f8ee3dbd484e588/4780295930.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2d2866542---besomonibewumotazikudib.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160739a4f214ce---66929901003.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/202694498.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ee07299f5e043e1f4d84a80fc5787b29/tutowi.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/68416790517.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/nisuwutosusawetagu.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/hfioeu6d0rre5qa4n3sdv6fe10/21937544588.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bf6dfde3de5---jadopepupipepegawar.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/08054867eac83be60170fa8a430d2e18/40469556262.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fe0ce6185---1059531469.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b1d7ceb0f---nanekenuzol.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/eaac17b5de88b296fcc51a18c84eb1ed/99979805692.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/vuvikerev.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074f8a01278d---jorivagesemupefuledolefoz.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2b200cc3f---20745059082.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/sefowuxewodumevojubi.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920d02e3587---52292351730.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/bufenisesiz.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/76968877755.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210704_27A3421DF51D5E58.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=possible+inferior+infarctPDF link annotation
    • https://tes-sys.com/uploads/ckfinder/files/20210713/16261258968047.pdfIn PDF document text
    • 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_off0001060e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060E 10468 bytes
SHA-256: eaa8bb18c4b27af3cad5f969a9769a4d7f9b504255189e5ddf034f4ae67c2c4a
font_01_sfnt_off00011dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001360d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1360D 17516 bytes
SHA-256: 21842c1315c8ecc30844d64ee9582552781f312fa0700ef137a0a542b921978f

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