Malicious PDF — malware analysis report

Static analysis result for SHA-256 927ec7e6274764d4…

MALICIOUS

PDF

69.7 KB Created: 2021-09-30 15:41:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 71208eef44b2128fde811e4f8b4e3ac5 SHA-1: bcd3643047377ab86643ea0a0c93f6d5fe9b82f4 SHA-256: 927ec7e6274764d4b6cd287ce069d086741f66dd6181040d411d752eb55e646a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to external resources. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to download or redirect to further malicious content. The link farm, hosted on multiple distinct domains including compromised CMS uploads, reinforces the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=blockman+go+hack+apk+2020+no+root PDF link annotation
    • http://amy-tsai.com/images_express/userfiles/files/12299986420.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/gisijepa.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/nigalowu.pdfIn PDF document text
    • https://sergiomauri.com/images/file/89921906545.pdfIn PDF document text
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/mitoxifejagedezorajipiker.pdfIn PDF document text
    • https://papiratisk.cz/soubory/bulodinuna.pdfIn PDF document text
    • http://schokobrunnen.com/idata/18314193576.pdfIn PDF document text
    • http://fxlcd.com/upload/file/lekijawebulopod.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/8gpkbm39jhk3n2v5uj2ofpinh5/78074080664.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/54257874018.pdfIn PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/48147575128.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310891705e8---kesaretipibi.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615242e068554---xiwomepukobebiveba.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/11749489464.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/3098673453.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/51230915349.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210927125610.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/keduviweluximatapafunap.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/fudeja.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/wipavadasisavuxizixe.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/goverolobeba.pdfIn PDF document text
    • 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_off0000af23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC735 15444 bytes
SHA-256: 3de3535709c3bbab68fd8e341032e49cab63c8744659dec2c4c6a6d7b8f24b9e
font_02_sfnt_off0000ee67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE67 10816 bytes
SHA-256: 05b41dcf2448f027918228be5a44ed2e2e081623429451714c0fb584a69e201e