Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dc14da352c834af…

MALICIOUS

PDF

86.7 KB Created: 2021-07-17 22:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fef7f1ac7d84c78a784ad6b1f9bb1086 SHA-1: 24b74e13419bc87da3544b7713e3d204f0836137 SHA-256: 4dc14da352c834af40b2b1ae7d2a50a712d9131679d1dfa55d2dbd934a9cd0bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to phishing pages or malware downloads, aligning with the 'Spearphishing Attachment' technique. No scripts were extracted, but the structure suggests a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1c5222f308---punikeve.pdf
    • http://ahs1968.com/clients/d/dc/dcea35c349c70fb55dca458fc6558ff6/File/42605049604.pdf
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93211046765.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbc952b2e1---duvuritewapugeg.pdf
    • https://serwisnawigacji.pl/userfiles/file/3642230250.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/b9c2add63a4c9a063316d8d67327064e/jaritidabirumoderofavu.pdf
    • https://all-new-wow.com/upload/files/91434493962.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160909d3a94c1d---paduvozadapog.pdf
    • http://hyosangjo.com/userfiles/file/20210715171908.pdf
    • http://fst-uinsu.net/userfiles/files/95594105154.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/lbdb913mbmb1hdp05tuhhgvp40/kobetowupe.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/68701i8joiq29c39qd2v9uim35/48490599976.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/q45m3er4ofpkvt540mkh3ctpv5/zages.pdf
    • https://altonika.pro/files/fck/file/38650754316.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c90092d1bbd---tumiresexewer.pdf
    • http://swaminarayangm.org/userfiles/file/42855198933.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/d454f286e53c39c5d307d118122e6c95/75307682318.pdf
    • https://almondzwealth.com/administrator/imagetemp/file/15261550152.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608252b5dd9ef---gavusap.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/fumqqb0q9nqhg740vfhuqaf963/jonasirud.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc50fc2a29---35437579058.pdf
    • http://ballarioarchitetti.eu/userfiles/files/98997364611.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=division+of+complex+numbers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef35.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF35 16792 bytes
font_01_sfnt_off00010747.bin
87501eeb5f7324229ab3cf6f9927072c1a81c5259f60a23bb1ae3272f08b9a4c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10747 17324 bytes
font_02_sfnt_off0001352e.bin
ea27a643a3ad7989cb894e8cc3dabd33024cd1ae93bcb85ee8525252ee205cc5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1352E 10792 bytes