Malicious PDF — malware analysis report

Static analysis result for SHA-256 47e35ee720daf17a…

MALICIOUS

PDF

82.3 KB Created: 2021-08-08 14:36:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e0c9d7a84dc472143e9d1ae83619b621 SHA-1: 0fc2bc1484f62adce4ca435980bf5da7ab38ef1f SHA-256: 47e35ee720daf17a781b79ae5e417d760062286f507ca07b6c22d201f2493759
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as containing a link farm, with many URLs pointing to compromised CMS upload directories. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The presence of numerous links suggests an attempt to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b86a8eeb2---xudalenonuk.pdf In PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/72239342719.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/673d83f7630682abf9959ee3cf3b1a18/78330151162.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ced38c91d4d---4966469802.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/0563kqf5ai62lg5el2s7jeuq04/59819463984.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081131688866---gexarupe.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8afc762f3---55800254158.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/totuvukimaxifikudulez.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/50656811297.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/si30kv6pnel77p83q2hutiusl1/65857267474.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///87059571143.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/tonudok.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160746bf857cef---57275523010.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/84ab0ee3c10cc3f537ac76d20c348d8f/11504315831.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1610412c4ebb05---661108863.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/lekukenuxux.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a54016a4263---retesujalonetenobavoduluj.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/d86ed8bc32c14d83e9ae8cda0ef7a3e0/51668525757.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/votibotulilo.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b564fa394b6---tepibukisakubodo.pdfIn PDF document text
    • http://bgindus.com/t/tutorfirm/uploads/ck/files/24922793967.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202108070441357154.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbe5c1ecc85---fufoje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=a%C3%B6f+adalet+ders+kitaplar%C4%B1+pdf+indir+2018PDF 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_off0000d744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD744 19616 bytes
SHA-256: c8e17bf17b2eaeda896c731485c63a6411421f0126d59ff4385671f83895791b
font_01_sfnt_off000106df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF6 11204 bytes
SHA-256: f58070dcea2d622f48766d215a2d7de4f145eeb05289b1d8e28f1566d259573a

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