Malicious PDF — malware analysis report

Static analysis result for SHA-256 1db8216acc894967…

MALICIOUS

PDF

79.0 KB Created: 2021-09-08 03:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 233114e4ee514e8b9cfe0ffdc48719b0 SHA-1: 26ef394473e4cf55ec8d6e0a895c633db9925d34 SHA-256: 1db8216acc894967bbf1bf5afea7f38d882b0f896bce0d77a064617dd0c5b15d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, specifically within form upload directories, suggesting a link farm designed to distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the structure and URL patterns are consistent with techniques used to host and distribute malicious documents.

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 https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9c36004bf---97227065190.pdf In PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805ae5bd665---15926698486.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/40124900579.pdfIn PDF document text
    • http://benjamin1908.com/clients/f/f4/f4560e3fe432b95d15e234f900dec36a/File/zifaxubewoxelugejal.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/l3fg3sv37vi7k1llo262jdmal6/83561533061.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/5e4907fc1639a649b0d5706bb160464d/zijejov.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885cbe7645e---rogumured.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160de16ea00e20---9077387936.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/kutibetisisibo.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/36950591589.pdfIn PDF document text
    • https://x-software.cz/data/file/guditomobinonamibefo.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f16e8ecb0b---dakamokanojiwakodo.pdfIn PDF document text
    • http://short-story.ru/upload/file/69912428957.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/pamixajurukijiluxejolusa.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/15059743732.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4815000630.pdfIn PDF document text
    • http://mmcaana.com/clients/29274/File/67486607563.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/tuxolunorekebimazilusiwam.pdfIn PDF document text
    • http://ozona.pt/wysiwygfiles/file/jajusipijug.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/6049841380.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/muvijolilupojilazepewo.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/fuvusiletago.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/zoguvexegogivu.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/32959882538.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=instruction+manual+for+whirlpool+double+ovenPDF 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_off0000d002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD002 16908 bytes
SHA-256: a02fbea36a33058056c3677b069790b6cb19a8292b44fdbb2297e3438e134b70
font_01_sfnt_off0000fc0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0D 11228 bytes
SHA-256: 8dd28583ad912f51bea18a5fcd0e26655bcdf4f53635c57937e231b78c4a0f83
font_02_sfnt_off000115ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1