Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b505ecb8c89d8df…

MALICIOUS

PDF

80.4 KB Created: 2021-09-10 08:26:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f34262d07da6015dc984c618aea70fbe SHA-1: 8948b6633c209fdda8a4120ca476cb01a7a281f8 SHA-256: 9b505ecb8c89d8dfd27ebb550911d651615209d860952e63d390d9833bd0ac85
164 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. The heuristics reveal it functions as a link farm, directing users to various PDF files hosted on potentially compromised or disposable domains, likely as part of a phishing or malware distribution scheme. The presence of a 'download button' lure further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7932

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.grdr.org/paidel/ckfinder/userfiles/files/31632992812.pdf In PDF document text
    • http://ladna.pl/user_images/file/29713593593.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/70669983809.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/43551876135.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/wapepukigubavemo.pdfIn PDF document text
    • https://egca.fr/userfiles/file/nunexijil.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/84087831595.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/dakagalob.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202191057503991.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/zagariguzomibalukebeza.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327478df850---73654764594.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/wetarolad.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/94c64c5e70bd34ddc6c133f331718155/35820288799.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/55622849445.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/xirakedifulajirabebunif.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a40a37496---83511777219.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/wulaxi.pdfIn PDF document text
    • https://majubesar.com/contents/files/sopinabasizuxuxere.pdfIn PDF document text
    • http://dc-3ed4d7413bdb.prshots.de/uploads/userfiles/1630897743/files/26349689298.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/tovezanaxunuw.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/48855982627.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/godewamuparu.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/tusofofuravutijuzepiforad.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/taxubogipiwubirudira.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/92312906080.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=download+attack+on+titan+apk+offlinePDF link annotation
    • 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_off0000dbb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB3 18720 bytes
SHA-256: 5e7f026bf98a6f75c4b69d2fa21c75a38306e733b18526b49e97c5215057d646
font_01_sfnt_off00010c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12461 10524 bytes
SHA-256: a38767991f1f26dac4719e0fb379df3b8551c3f454ffce6df1632a8fcc22989a