Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b4149e5d462f10f…

MALICIOUS

PDF

70.9 KB Created: 2021-09-27 16:42:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f7fbe355f82d40ae2cae6aeb6060eeaa SHA-1: 096e0fd06e0cfb5adbdc3fdf7eedd1cc0a101982 SHA-256: 8b4149e5d462f10fab1f497a2bb5a5c5a0ac3e146a7401823a642e7174b01fca
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. The document contains a link farm pointing to various PDF files hosted on potentially compromised websites, suggesting an attempt to distribute further malicious content or phish for information. Although no executable scripts were extracted, the presence of numerous embedded URLs and the 'SE_CALLBACK_LURE' heuristic indicate a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://musikpark-live.de/userfiles/file/31809375919.pdf In PDF document text
    • https://cafemocion.com/userfiles/file/bazapezabag.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/piwaxuredi.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210906183523.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210910_7A0F4EED6EDE5143.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614e89b005305---59057361504.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/27152181044.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/dusetoxunezo.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/42553574579.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/3929691831.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/23244308037.pdfIn PDF document text
    • http://shendaoguoji.com/data/attachment/file/nofupuxuro.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161438ac158b12---69544725444.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/kexudipotapubulesomunovef.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c0693c891---9389511748.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615119b827f8d---98486570039.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/12613285240.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/falufa.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/39324345335.pdfIn PDF document text
    • http://aid-calais.com/userfiles/file/juvusegigadifoworigifenen.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-1/20210901084523765164.pdfIn PDF document text
    • http://shoreluxurylimos.com/userfiles/files/vatonipat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=fortnite+100+level+deathrunPDF 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_off0000b300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB300 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB12 16836 bytes
SHA-256: 2eb586f0ea2142d1c5bd9166cc300c17ca55df073510e5312ddc5f3481ebd85a
font_02_sfnt_off0000f645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF645 10492 bytes
SHA-256: b7974628c9e8f6ae3051d61fb5e5444870c6bb62bf9a2432af715cd169ec0a1f

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