Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed8490a52fcbd339…

MALICIOUS

PDF

102.5 KB Created: 2021-08-31 18:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 825f38739de65fe0b341a84ce26f67d6 SHA-1: b0c647c0d8eeae9f30baee4008832c31af7eb837 SHA-256: ed8490a52fcbd3391d8860dff6837afbf519ccf176ee21a2fff9a7692d7d8178
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The presence of numerous PDF links on potentially compromised WordPress sites supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • 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.
  • 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://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/3e63ae75f7b7a1deb7aa3452e0cc5806/faderojipewulozisav.pdf In PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/fn9m1gv7dueuojdbbp3fi4uu11/30580824421.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/tezemifagetipuzasojes.pdfIn PDF document text
    • https://kompaspt2.com/contents//files/kezevotobupitofana.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/219227be006d50906f75a854b6cff9f6/44653815871.pdfIn PDF document text
    • https://signika.pl/Upload/file/jipavabodevomedelojo.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/81726336161.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/tedurumofoxo.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/e1bed8e2ab0369c6fe886121ae22a58a/25833598934.pdfIn PDF document text
    • http://jogforbigt.com/clients/6/61/61f7a61d17da296148a50ccd59c4a139/File/ditalem.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/kegen.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/uis5k6p5uje3dg7ss069s0fsip/40572401441.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/b1iupncljerpl1qeudkb6akh94/40142467699.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/uhsrivks8ll7m0j6tb2mh7hs6d/12646548106.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/bofufudosexebuborolapir.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160db1ca89fcdc---sinejerosunuvijofafil.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/45275244331.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/bodebikibosewije.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/80837340945.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731a833316d---34974046588.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/xuzemimer.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608a56bda2989---32560596358.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/17671865105.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=main+conflict+in+romeo+and+julietPDF 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_off00012be6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE6 18300 bytes
SHA-256: a39e9f47c268709fd95da5c21944bfbd7c074c1562f4edd4ea40f676cb8b6d89
font_01_sfnt_off00015b7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B7C 10692 bytes
SHA-256: 514992e9286f87497077b3911a7ba74da0f4c19f069e1248bccf2cc97b2dc748
font_02_sfnt_off000173f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1