Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec94997536c166a2…

MALICIOUS

PDF

78.6 KB Created: 2021-09-04 10:20:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0e1501161431621f5eee01eaf580af2f SHA-1: 495ec6b3642dbf18d850ac3b9c27f477a725b09c SHA-256: ec94997536c166a2efdff075b0710b8ce1b4c5d06ae1f3807de05bcbf767ab99
104 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm or SEO poisoning attempt. The ML classifier strongly suggests malicious intent, likely to exploit vulnerabilities or redirect users to malicious sites. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=ultimaker+2+user+manual+pdf PDF link annotation
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/016d54b77bab73b96904e48302e741c3/12297778747.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/3129387002.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/49305112820.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/85843fda607fc4c35a47201a711a4ecf/62134640775.pdfIn PDF document text
    • http://francisfamilyreunion.net/clients/870293/File/fupitusixolelow.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/vosujadebixesus.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/53940078486.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/11238678055.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/73094560150.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e32bed41381---nunomaruj.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/so3f0s1d3mnathbcpeqnt7h1dv/vugerag.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/49844422442.pdfIn PDF document text
    • http://asmolmerdiven.com/depo/sayfaresim/file/pinusipisovezizudetopu.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b2809e6c44e---kuwasiredopur.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/45868893786.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/65899367191.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/sekoziguzimani.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f518dc5dbd---89484846068.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/31368513201.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab09006511e---lipomonet.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762dcb86afe---42719865815.pdfIn PDF document text
    • http://celiapopememorial.com/clients/4/45/45605e685ba8a3b32f56966823665796/File/saraki.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d4a7e6104---vazonilevuwelojezudejeti.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d215e45394---purokisoperokuve.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160721db82af93---66294846096.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/44689680532.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_off0000cc22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE439 10860 bytes
SHA-256: b9d3f84fc4764e6c916f237156b7306c86c17a4bfc8adb0c2c10c2edb617b798
font_02_sfnt_off0000fd4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4F 18252 bytes
SHA-256: d80472c539df4ccc829ba4ab5d1a2a2f530a64b745483907132e45386c9a34da

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