Malicious PDF — malware analysis report

Static analysis result for SHA-256 61e57b4b74aa9ad1…

MALICIOUS

PDF

83.3 KB Created: 2021-09-06 21:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 581b3dbfb4b92604ac4a2fd67f11d3e7 SHA-1: 030c92aa71b6d82cd3b362f49354a09cd463f84c SHA-256: 61e57b4b74aa9ad192a255df2d9769c20ea96a654bbc4934626fec6a7337b2d5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://lg-palette.com/upload/files/gidevakogoxogebudugili.pdf In PDF document text
    • https://iwanbim.com/userfiles/files/lilesavoduk.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/74073792915.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/13985682334.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16073fbfa9ea0d---koromafar.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/op7dhum4bm2ukuth39avkrso25/96465551018.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/18856783347.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/a5bb3f83ce49fa4cb594153dcc2054d9/vijevidase.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c2ef763d6e---tarib.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/44405175659.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/89004ecb970af355455dbe6508719d8e/49563597671.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/xoditipidebi.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/a0fbb2e13b6cee50bf7d9e8421fd07fc/pegesewom.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3828f6f074---99109461631.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/8pkqs439v6caqscnnt0r4h3e2i/64970854003.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/xotejilaripobikiforex.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/8958024123837f8609276b6684ecaa40/zunatobetepapobukopojaw.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/3hn77d8vm69mb80bcuae2hjmq0/pimatepibokujap.pdfIn PDF document text
    • https://hijaustabilo.com/contents//files/busatapo.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/43253152947.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d34425d46f---97923018302.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609883fc106fa---nijufigewetavigarivumumi.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/4430667622.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=arihant+biology+neet+book+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_off0000de3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3F 10936 bytes
SHA-256: da5918a9351a316572972013346469032a15dce94cd9fdebbcaa9daa7f593750
font_01_sfnt_off0000f723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF723 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F35 18496 bytes
SHA-256: 0a1c65f392da9063a0cb6f084699b7d9ecccbd39a30584a7aaaac29fab9fab77