Malicious PDF — malware analysis report

Static analysis result for SHA-256 12d9e16851f87d5a…

MALICIOUS

PDF

77.9 KB Created: 2021-09-04 17:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 77277514d114817648b7bb3857be97ae SHA-1: b9541411c7021d6569298f8ef1f0074dd09afdb9 SHA-256: 12d9e16851f87d5a57573ee23def5f8dc54e452b3b5290725ddcbbf6a86908d7
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised CMS upload directories, indicating a link farm. The ML classifier also flagged this PDF as malicious with high confidence. The primary purpose appears to be redirecting users to potentially malicious or SEO-manipulated content hosted on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 5

  • 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://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/7875a3f71b61b109e631c4d1ac0c0164/72982469455.pdf In PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/junifuwotimem.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ded508c7f0a---losetotazesegunuzano.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/99030252372.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/72479538184.pdfIn PDF document text
    • https://jagamimpi.info/contents//files/90836304379.pdfIn PDF document text
    • https://folklorebridge.eu/uploads/pictures/files/21205031624.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607166f07add6---zetolezinak.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d4272341c---widuzajoluw.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/oi0bift8rksrgn67n0a6q0hs2k/15963734923.pdfIn PDF document text
    • https://ibericadearmerias.com/file/getixalupanezepadul.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3189258d0---47548250717.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/5686562519.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/05f6k17921mmv0g3nl4l6ks9ij/pilutogexivowovusijopogis.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/6e9e873e2560f9601875f03b4f4c200d/81403713385.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/9c8440609face8abb0bdfaa8e4fcf746/fuduxotifemuromikunotalax.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/89353234401.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/79829860950.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/1325674544.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1608c492057f0f---47430887070.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/9556912fe166734863e6a998e9111044/rotapujizelasuroloxod.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/36336827156.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=bosch+series+8+washing+machine+user+manualPDF 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_off0000cc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC94 11028 bytes
SHA-256: 45da9bc85231b6632e66820722f2eb501bed38ab0262d4d4c15d5155fde6534d
font_01_sfnt_off0000e620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE620 17220 bytes
SHA-256: 5d54c3a82f2c787679715cc37e59241e644a1525d984979e5817f25fe62ce40d
font_02_sfnt_off0001122b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1