Malicious PDF — malware analysis report

Static analysis result for SHA-256 529d1402128cb27b…

MALICIOUS

PDF

70.4 KB Created: 2021-08-28 16:18:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 073c3fe7ab121ad44d2cc62395aaaef3 SHA-1: be219bc8ae57a3402bc21151043547766adc5075 SHA-256: 529d1402128cb27bcbf03b49401955796192ebe143fb280b3a49b0e621c1e4b1
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external sites, several of which are hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially malicious content or phishing sites through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://malagi.pl/user-files/fck/file/jesadejupiperom.pdf In PDF document text
    • https://muacash.com/webroot/img/files/vigezozofavonugaz.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/batijolabajexetaxi.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160907a0ea55e3---tufedulapix.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2a171690c4---giginosaralagivetibi.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/161116a8b149c8---gukemejevupawe.pdfIn PDF document text
    • https://limsurempat.com/contents/files/kalotobala.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afead75112d---70275312939.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/90498281390.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b05f8d88697---70663925619.pdfIn PDF document text
    • http://soles2walk.cz/data/file/44367845395.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/simonu.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/pawifexibadupujefupiru.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/bexivud.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/6c5ba230432a31a0c421e63b3ebe5170/1833516279.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/fubikoxiwinef.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/860ea99376fce202b92dd8b26f70364a/forijanirixutoxomokukubew.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/23559958897.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/1865o9t37ngangdo0etdjebqr0/8240745616.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/84675514686.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/12848006562.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/48c59c1dc160cb6381f771223d4d3357/xumogavidoni.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/30157458455.pdfIn PDF document text
    • https://fong-cai.com/upload/files/vaxomus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=want+in+shakespearean+languagePDF 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_off0000b52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB52E 10596 bytes
SHA-256: 12c19258faa4fef42b3949a0a1acb17d44581ff6b868b984601cb29b5df66b6c
font_01_sfnt_off0000cd55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD55 15064 bytes
SHA-256: 9c8734a29f4603519b8239d2660bed20bcd413d5929f858a8615436ad3f9c2c4
font_02_sfnt_off0000f3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1