Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9a54bd79535290f…

MALICIOUS

PDF

96.1 KB Created: 2021-06-26 03:12:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0da4ea76c35fd35973db2a84e921c974 SHA-1: 5e7d89f1db41b3e4f1be2095b67af61e37211277 SHA-256: a9a54bd79535290fcc00fbbf040776f1264e278d3fbfb18d027e35853da7822f
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links indicates an attempt to exploit users through deceptive content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

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://dienmaythanglong.org/uploads/files/95014508441.pdf In PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9dea9381b---25231774329.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072033eb9398---53000339726.pdfIn PDF document text
    • https://dm288.com/slicice/file/sogej.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c335c8e17---wikazi.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c43f1ba552---botubalaxafugan.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/2f760f7e35cce088f3f87e0ab9df41f8/nonilovuwebetivuwan.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/1d3h4igv1m67h8l34c6bejmof6/71072504008.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160a77ddfcffe9---20295295488.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/55031331347.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/zubuloduso.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/7373191717.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/ec8158341faf6338dd173acb9482d188/56931662475.pdfIn PDF document text
    • http://dongphuctqueen.com/upload/files/47657594667.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607418441bb71---55431685110.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/gijaniwuzizakulilanasakow.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/miwalevamamuzudutesag.pdfIn PDF document text
    • https://coevent.ru/upload/files/xafalabudanavawu.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607716b18bb51---85792821292.pdfIn PDF document text
    • https://xn--arbeitskndigungsrecht-best-5zc.de/userfiles/file/xesarifup.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/13447772044.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608729ec04cca---gelosaj.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ho74vmnmntq7k0969unu6jau47/70149969713.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=naruto+magnet+releasePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10824 3332 bytes
SHA-256: e8037f67cd0cc9eb8ba7c3a6c759915842e785922e2b3648e8661d7b53fb7b40
font_01_sfnt_off00011564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11564 17616 bytes
SHA-256: 23d178a72186c00bc127f8fa13dc5aa020cd906a6fe4d651154f27ec19412e73
font_02_sfnt_off000142dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AF3 10436 bytes
SHA-256: 6c7fd75e66b86691023f89674f6546a299681fa7ebe75989dfdc0bf923f85bcd

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