Malicious PDF — malware analysis report

Static analysis result for SHA-256 e622113b46db70e2…

MALICIOUS

PDF

83.4 KB Created: 2021-07-04 03:30:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 70346c873cb879717d33bdd8ac9ae6e8 SHA-1: ab3ac22c1e5e197938e37a1a4993b70550faa650 SHA-256: e622113b46db70e27ba2a7e412643676d08967d1a1d1266654e39daadd45cf81
96 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the presence of multiple distinct hosts and UTM parameters suggests an attempt to manipulate search engine rankings or direct users to potentially harmful content. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to infer a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/a1d9ba786fdefbb63ced4f54598fd966/wezaxegazevaviboredeju.pdf In PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/58729c6cb0f16b3fc7a57bd3b8190616/lagofotazifuwunazopunab.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/e78e4ed4fd99af3890cebc69aa2a41b9/5941935016.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/c266f243a9d94d62b52689345eb014b5/vizeto.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/95582785427.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/cjl9fm3amesep0ihr12q7s17o0/17938243102.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/bujovaxanivewakavoforaba.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806ad4adbd4---kigajajizonu.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc82863ca6e---62133874945.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/e84b45cd7867769a104e9c098c0dbf9b/sozadazimomutif.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/09osq16pqr1ntbh2bil3ik8g00/58624960373.pdfIn PDF document text
    • http://maybomchuachay24h.com/Images_upload/files/ganiwemosuw.pdfIn PDF document text
    • http://webinside.pl/userfiles/file/94315313377.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/o4k1jeldpis9p7eed1o7pp6h22/bobeloweberasujadu.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/v973uv2achgn3urpefrnl10och/19890177680.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/20329225726.pdfIn PDF document text
    • http://zzliuxue.com/upfile/file///pasefenewabuni.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/68784812815.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/2b8987a64dc46c2959084aa0fe22e006/nufejiwapulotumulojo.pdfIn PDF document text
    • https://oklasik.com/ckfinder/userfiles/files/83221050029.pdfIn PDF document text
    • https://x-software.cz/data/file/7046081785.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097ba7c39f70---31029314634.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/63509569195.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/l4du94jfi88929ido87sjtlsgh/25929609563.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=1st+puc+history+textbook+answers+pdf+downloadPDF 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_off0000e081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE081 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF893 17320 bytes
SHA-256: 177f2efbc748f45c0277a346ecb8ee210fa47056a6485c10f53f53f441d06bfe
font_02_sfnt_off000125d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D7 11304 bytes
SHA-256: 11f1b8e44cf11bfee2981c40c1dfd8e442afac5f8f6066bfe45aa5551ebebd95

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