Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f5fc341bb220438…

MALICIOUS

PDF

91.0 KB Created: 2021-06-12 23:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 91d6733fc9c2003d2b4f22680bb205b0 SHA-1: fe629ab0a9a4ed03d4b18836ae713f3a15fea964 SHA-256: 1f5fc341bb220438a028279a2bdbc4fa934c353b9690a37d069aa724bf2c94b6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. The embedded JavaScript likely serves to redirect the user to one of these malicious URLs, which in turn may host a payload or further phishing content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://allytemp.ru/uplcv?utm_term=pdf+xchange+editor+7+download PDF link annotation
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/63b5f610076c16b56e6fe2ba7715a8ae/wokikinego.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609410aa09c50---jibunimerivari.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/025iq7m91dn5q13p4sumvq4va7/gasasikubidata.pdfIn PDF document text
    • http://esejsc.com/upload/files/2438115993.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/18f20658d72b04cfa948da0bdb790516/33077719643.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092076b15613---85323249574.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16071925645ef7---38595587666.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/86673910913.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/76979896258.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210606_58A86C7411C49957.pdfIn PDF document text
    • http://aweibel.com/Photo/file/gikofuzebinerevipilajige.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/qor19q2gbeu78dntmld0qbc8rk/18679931608.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/fcd6ca0f67cfd92dd60b3d431d3d6c4a/84289901450.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/578b41ad35283359114643940997d620/vukogumufijikumezokosub.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9acd3ae54---38947691151.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/60469350028.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BF 5132 bytes
SHA-256: dc3312aa2c87da96409f9ff23f33bedb211ef3af8d0f5d136cbacbc39f6f9029
font_01_sfnt_off00010435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10435 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off00010cb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB8 6068 bytes
SHA-256: 58b4873d33ac9fffaf45ed1a2312b8eb5fadf3b067e77f8cfe9e87095f6a7717
font_03_sfnt_off00011c69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C69 22748 bytes
SHA-256: dae3e7feca9213bb3e4320e699c99589162c4b9e4242e538fc002533b2198685
font_04_sfnt_off00014f59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F59 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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