Malicious PDF — malware analysis report

Static analysis result for SHA-256 e41a2b2184f83a63…

MALICIOUS

PDF

71.4 KB Created: 2021-09-02 13:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9a1880b770f05baff1d958540f4fd7da SHA-1: 576aa386935893596b598b9bfdbd1a10dc8044d9 SHA-256: e41a2b2184f83a63f100404c954d43a3d0eb6c04f943272d8565b27deedd1ad5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards an attempt to exploit users by directing them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://peusch.lu/userfiles/files/pesusororumuzabetakutaku.pdf In PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/pajun.pdfIn PDF document text
    • http://vintageguitar.ru/ckfinder/userfiles/files/23743826925.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/defabepipelamolo.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160774c0f706fe---lovonelozejodarelalubi.pdfIn PDF document text
    • http://test888.org/uploads/productsfiles/20210625232432_9bf94.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160af055102899---papavobanaxutuwasufewi.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/79472035760.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/736248213e79c3ca504b86be7f5c4527/44315356473.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c6d75a7bf---wakowipi.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075dc2eb62e0---roware.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d27748891---tomagirijakutubipeloxisax.pdfIn PDF document text
    • https://deepankarbasu.com/FCKeditor/file/81468663539.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210525130622.pdfIn PDF document text
    • http://ruresept.ru/files/file/vuvukomeboponikolabetuv.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/lm4bd82ph7dseaaa28eefufltn/8071247416.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/tebepaxozoxefitenojevet.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aab65be2202---42786090447.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/fexakosurerurugujaputig.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/50178459005.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d3c751a01b---doxuzabep.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/90321385256.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/vfuukfvn5o6oqe868eovt7194k/24276083927.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16617494547.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/62806631310.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=chapter+6+traffic+signs+manual+irelandPDF 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_off0000b675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB675 11248 bytes
SHA-256: 48c1346f47d6a8500a716cf44fea250dc7412b441818acec6ff3e2b8bbea5f01
font_01_sfnt_off0000d078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD078 15372 bytes
SHA-256: 098aa50e8cfc68d12a7e5e98d75d577c33bd08cf007afc930a39d9f4e0340765
font_02_sfnt_off0000f7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.