Malicious PDF — malware analysis report

Static analysis result for SHA-256 920411a724bc3833…

MALICIOUS

PDF

113.5 KB Created: 2021-06-25 20:15:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 53ac4e632904301ece13340614205300 SHA-1: 65b5501e634588db89a64d11ade0b9dbc67b3134 SHA-256: 920411a724bc3833099a79b61f31dd107b0b2c1fd17baaf090d859e817affd29
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites, some of which host further PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to distribute malicious content through numerous disposable hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/f4fec827727232c0553160ff401e6fd1/dabofibuzibux.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce814e98e2---57185827086.pdf
    • http://pathtojanna.com/userfiles/files/66840748240.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/734e4291d75bbb8de993af079f8fc523/38601392784.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/19f17435fbfd19024ae8778937c46c05/99027521275.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075867c2ca65---sowogemenigo.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/97ng358ee0ukeltioro528i3j7/77195653261.pdf
    • http://ibiforstarlight.ca/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/senelizemegovenipa.pdf
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/13744220761.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/cdcf424b4209c9b4b49ecc6ef4c97a4b/95445078644.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/ee0d857c7bfcb980e8af49d7d3708f62/gelikinapalujagebufuwul.pdf
    • https://preciseenergygroup.com/media/40984344496.pdf
    • http://szyldkj.com/luodan/images/userfiles/file/50799956996.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/fc5e6d6f7a70b4bb95b0a2e65b2b83dc/vajaxoduxisipuxi.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/4f765c3040657e199703a186290d6f36/suxonarogevuwezipubonoka.pdf
    • https://planet-for-events.de/userfiles/file/29411119453.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3bad19be3---85373680539.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/5g7oncq6dmhq4rlss4u0cci6up/5142499189.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/49f302e500859da8ff881322a1d109bd/fodekila.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fedbdb2ca---50161052622.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e78069f97---30910621491.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160794c4556f83---4875973190.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/6b611eb085535edec1dcb82fb0919875/71795126096.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e2eeec02c---kumopewuvanipakeweweda.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=lamar+odom+clippers
    • 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_off000159c5.bin
359087b335cf3b57ec3420128f3a4dfb6098700d9ffc1df1852e86d1e6227d04
pdf-font-stream PDF embedded font (sfnt) at offset 0x159C5 10432 bytes
font_01_sfnt_off00017154.bin
2c22bee75c05b12aa73cd1b408c531185e6e239c0bbf037e0cfaced7060b6727
pdf-font-stream PDF embedded font (sfnt) at offset 0x17154 18088 bytes
font_02_sfnt_off0001a0de.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0DE 16792 bytes