Malicious PDF — malware analysis report

Static analysis result for SHA-256 13de4b7e0710af04…

MALICIOUS

PDF

82.6 KB Created: 2021-09-17 08:23:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 70dbbb8360af8e1b9a02cc8ff0426bc2 SHA-1: bf6862c2581d84a06853ae6534b09334ce43efa1 SHA-256: 13de4b7e0710af0477a79a4674589b7c7498ee018f9a8732fa71551f7744e267
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. The presence of numerous links, including those with UTM parameters suggesting tracking, points towards an attempt to lure users to download further content or visit malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://wickedcheesy.com/images/file/15842862210.pdf In PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/vadabu.pdfIn PDF document text
    • https://senfina.top/uploads/files/rileduledoro.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/tewidoda.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090603081615652.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/91959043974.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/ninum.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/14532657955.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/21405549936.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/nusur.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/liludososewoxaradozufox.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16143f14a991d7---23900180138.pdfIn PDF document text
    • https://rafautama.com/uploads/file/xumobepomadimekug.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/dejoponetovagirusa.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/62889926188.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/gufalobutowi.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/a57677abe2889f017bdefefce674c2ff/wepafenogokunibo.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/zanupikabakaxijusup.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a5ed66ac1---72109490182.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/69629369249.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8d1bbe540---vugasalalasufobemolomi.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/c69fc9d03177c50dfa1e0125928d9b15/jitulabibofamekowalu.pdfIn PDF document text
    • http://kezheng.net/Upload/file/defokavarawixinigijikere.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c98a9b3c2---jikusamime.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=cross+dj+free+apk+downloadPDF 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_off0000dcfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFE 10640 bytes
SHA-256: b14b703b6247f0f599b12a016e67370a36c36926ab271ada0cf6cb4578278dab
font_01_sfnt_off0000f58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58F 18164 bytes
SHA-256: 986e66280b54ae8d82af8cd26cfaa1805c2f877ffac83d3b7054353dcd7d461f
font_02_sfnt_off000124e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.