Malicious PDF — malware analysis report

Static analysis result for SHA-256 96d12fb0b948c04c…

MALICIOUS

PDF

89.9 KB Created: 2021-07-24 01:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d8a394efa4886b38a800cb342da67b70 SHA-1: 480d85be674c6a367c5cd60f2e7ea5c2fed61f6a SHA-256: 96d12fb0b948c04cc46953315f2b28fda42e84c06fb31161490b690af395add4
96 Risk Score

Malware Insights

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

This PDF file functions as a link farm, containing numerous external URLs. Several of these URLs point to compromised CMS upload directories, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The ML classifier strongly indicated maliciousness, and the presence of link farms on disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://sochi-vitrazhi.ru/ckfinder/userfiles/files/sogurupomebolewaj.pdf In PDF document text
    • https://tepihtrava.rs//files/ligafovu.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/2vi0ab1iohocn6bnuq5r3ms7gb/749894613.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/ad1004b994e3a49f526c28a05438cf8e/9571763681.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/69668302893.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a89b0be0876---31853479797.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/minalebarafizusaridez.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/42724947408.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160797b5b68e5e---detimemosapap.pdfIn PDF document text
    • http://bjjiffy.com/upload/pigosijotawitapabazeku.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/17802687369.pdfIn PDF document text
    • http://yuha.be/_files/file/34133543766.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/9cf6a14f626dc261efb3a2dc808e7c49/gobisepogosenuvuzi.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/kewujav.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/ramewetasasagubi.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ae84744ef---19131335509.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/lewamozilegimikaxa.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/naxadijawuginibesov.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a4f997576---tamaxitesizefa.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5c4263edd49a1e7b49a0d06c636cf44a/85710911304.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a85623845---46197885149.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d28d49df76---83799936789.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608899d60b9af---20254579724.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/33944290380.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/51d25f48b54f27ef54bc7500f995833e/zajaguf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=direct+indirect+speech+rules+table+pdfPDF 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_off0000faff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11311 16952 bytes
SHA-256: 4f8efc256ec821cd603157a413ff642a7e33270e3f9e9ccbd122d145de26cbb7
font_02_sfnt_off00013f3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F3D 10840 bytes
SHA-256: 9ef1c13d50ae166d989d1d9ee1a65491010f8d6540d4c50de2b07e0633a54096