Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd5508c335932b52…

MALICIOUS

PDF

195.9 KB Created: 2021-07-15 12:41:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6a8e14902244278c7fb942899c69abed SHA-1: 1a8ef0137da165586e612e43570539d7349f3baa SHA-256: cd5508c335932b52d791a458794366d064e268caebb41470391e9dc5148ae95a
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains multiple links pointing to compromised WordPress upload directories and SEO redirectors, suggesting an attempt to lure users to malicious sites. The heuristic 'SE_URGENCY_LURE' indicates the document likely uses urgent language to prompt user interaction with these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b8f6cd43---83748779311.pdf In PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/xowepigodijadunexosesawir.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/mff4sncllu3hf5fg665uhr6ua1/3856238556.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/10647600448.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/15151289177.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/07o33br58si9qvac6u529olhev/26244767707.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b780ccde179---ganasididulubuvixitan.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16094dd65f05a9---80458532228.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210621165310105.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/nupusanomifon.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af921605315---13304905708.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e934a436639---bifabuwofafonedigefile.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/fatulajezo.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1ac6ef74f---79019004119.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c51b3668d54---kipavasurawajilujiv.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/64a60a3bb16b14eb6e51e36e5363d782/mijajipelevimoxid.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/famime.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/dojam.pdfIn PDF document text
    • http://apogeeconsultancy.com/upload/files/57104708289.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/f00eda07ae58163ae8cad3bc95b2faa0/telugeteb.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/109331365660abf64eb7cf0.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=guess+the+sketch+onlinePDF 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_off0002a211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A211 10296 bytes
SHA-256: 252de9a2edbec80e7f2afa8d9500708fd7aef4dd1e075f31856bd8196b585011
font_01_sfnt_off0002b937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B937 18424 bytes
SHA-256: b7d2418f2299d147ab55ab88b7721ec90f56a4daa3635c96d823e281a46e6bb5
font_02_sfnt_off0002e9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E9A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1