Malicious PDF — malware analysis report

Static analysis result for SHA-256 d57194f72fe6ee28…

MALICIOUS

PDF

77.6 KB Created: 2021-06-29 01:34:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f8d4878ae988a851e00a63092c3c5bae SHA-1: 10ce471a8a0a5f20dd4fddf93e30fe634ceba3b5 SHA-256: d57194f72fe6ee2883c0e9a079c41cd9b703adc4902d4bc4df7885b957d2da0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to redirect users to malicious sites. The primary purpose appears to be directing users to these compromised or disposable hosts, likely for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://bangdientunhk.com/upload/files/14392643925.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a9463427063---luxeditupefororefixazazo.pdf
    • http://midel.me/userfiles/file/fenugawopugejefebeful.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081bb8f569aa---mibuxubedodu.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/d847d9298e6e0529f0e6c63d783f2afb/56847650117.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16086f31287cfb---62147004207.pdf
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/2552730b8b82ec669a9406c5e5cbae24/xojilik.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c1874a76---26714335189.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/8005984250.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/002b46bc057bde8d5a5b8acc2a725d8a/31382283678.pdf
    • http://anatolianlgs.com/userfiles/file/tutixike.pdf
    • http://year-c.com/upload_fck/file/2021-6-2/20210602170937730763.pdf
    • http://ankaser.com/userfiles/file/47804378035.pdf
    • http://heyumpnd.com/userfiles/file///78393259376.pdf
    • http://sity-luxe.ru/userfiles/file/8742289766.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/96b8484e6631229bed5d77953ffdf877/92117397493.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c080f9f1567---73636735702.pdf
    • http://banghetretunhien.com/media/ftp/file/sunifopofonizag.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f61c56e3b5---tuwobogiwofoniwomene.pdf
    • http://eraucheta.ru/uploads/file/29455424314.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=sovereign+grace+hymns
    • 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_off0000c98f.bin
aaec67f2511559039a43176b4cf673d4190da48902caf86fc2f8866f3e7130a8
pdf-font-stream PDF embedded font (sfnt) at offset 0xC98F 17552 bytes
font_01_sfnt_off0000f797.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF797 16792 bytes
font_02_sfnt_off00010fae.bin
c4fa7adb5ce2a1e245ba6799efd77fdd604ed5a0fa2e41c51dc6516be976f473
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAE 10788 bytes