Malicious PDF — malware analysis report

Static analysis result for SHA-256 eecfbc21cf140792…

MALICIOUS

PDF

87.1 KB Created: 2021-09-08 06:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 55c65547cbc1c38a49dc6d2d0f5e379b SHA-1: cda389f9cc4ffde4a57cc42e1adc6621f003ab8f SHA-256: eecfbc21cf140792e6d24143dacadab3fb489416e1ea52bcbbcc8fe8a287f11e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites. Some of these URLs lead to compromised WordPress upload directories or use disposable hosting, suggesting an attempt to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://www.alapan.org/fckimages/file/lefozozotu.pdf In PDF document text
    • http://joesservicecenternj.com/userfiles/files/69560936382.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/komulejonuzizumopugiza.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/44122910772.pdfIn PDF document text
    • http://somersetcountybar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xurazukafofarudam.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/59545246764.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/vobeki.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab38eec4250---63032356164.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/69999179528.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/sidinixobafevalugefu.pdfIn PDF document text
    • http://spec-so.ru/sites/default/files/file/wevodira.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/14028819191.pdfIn PDF document text
    • http://leilehua76.com/clients/4/4d/4d80c013f15dbe3c797666a457780dca/File/pirimediwufed.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/67ka6hjb3ojn7k0m62natalbd1/kadabisubidapemurizawa.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/37029377262.pdfIn PDF document text
    • http://juicewarenhuis.nl/app/webroot/files/userfiles/files/vipesaguta.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/kegawejadebakotad.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/jevikaw.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/narag.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/585279c4b5dc7cfd19536685426402bc/94865197006.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/noxutijadiferofiwoje.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b24d67e7fef---sulavolupedubifudebewuwog.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/89225893191.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/67bb5a52778be5ac828caeace159b7b5/webosulibubasidujiwofax.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/59907361996.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/34305862085.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=aws+devops+certification+syllabus+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_off0000e9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C7 11100 bytes
SHA-256: 6c1ffe016554310b8439c5859254dff35dac165a828bd0930d71313970c5f308
font_01_sfnt_off000103a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A4 19304 bytes
SHA-256: e650bd34db07010068e096f147ef08303a1d4b53a4b94f3e3159c4b5b01c0941
font_02_sfnt_off0001361b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1361B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1