Malicious PDF — malware analysis report

Static analysis result for SHA-256 80cfce660f36fa80…

MALICIOUS

PDF

83.6 KB Created: 2021-08-23 12:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2e31cd8057974e1620c503bc2abb5896 SHA-1: 0c7119c0c07d996e4ee239b7a3cd554f13648443 SHA-256: 80cfce660f36fa8062f283207d7b9c8677ba4ca5324e996833592e84f712cedd
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/3c8kitq8kvhs3ut0qa2vng7rob/domudegamimuleba.pdf In PDF document text
    • http://dungculamdep.com/fckeditor_userfiles/file/sarojemavuzoxo.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/gru2tnv4t77evhn8unu8s6cd40/webir.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/11747825871.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/wetokexipiser.pdfIn PDF document text
    • https://flying-vikings.net/UserFiles/file/kusegedarelupebom.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/55544269166.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/43468686666.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/83042020761.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/94388254141.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/30kd6fencs9enegnv2218g96ot/nixunebafujofagewubunok.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/90047355060.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/9e762d100538a123c48560705d3c8e24/25971222793.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/86237069743.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/dofiroruwidoxiridu.pdfIn PDF document text
    • http://stevis.cz/files/file/kufewurakegevunepazigev.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826aab39d70---malosojiminofilaluk.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/dodugazi.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/45225249664.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/161001b32edf16---18880281589.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/84df9a76e3a02bb3f58f7d5a4ac876b0/lotejowuwewewaf.pdfIn PDF document text
    • https://warungmimpishio2.com/contents//files/97576116994.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/bebumib.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/b0bf2a7fe28fe1178ae7fc4c29195a3d/17252436949.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/b57e854dbf31a2cad80791152d34fe40/88588249453.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=dave+and+busters+nutrition+pdfPDF 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_off0000e1d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D7 10752 bytes
SHA-256: bf35f65f30fde5683a00adeb7a83e9550c7fce491cefe03f208d009b855fc2a7
font_01_sfnt_off0000fa83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11295 17588 bytes
SHA-256: e2c18e9c4638161f1cf8eeab81415829c758fecccd7362d6765529f5cfd7f009