Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c9fd94bd0a5fa34…

MALICIOUS

PDF

92.1 KB Created: 2021-09-18 05:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5c0aac45caea6c086a7cc085841a1953 SHA-1: f1453764a86c3b1cafa081c1ef43eebddd08f2ae SHA-256: 8c9fd94bd0a5fa34fc4bfb8567f4e304088a39d90d69034d548ba7f09415159c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to compromised CMS uploads and disposable hosting. While no scripts were extracted, the nature of the embedded links suggests an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://gzsjlt.cn/userfiles/file/29863338411.pdf In PDF document text
    • https://dermatologie-francophone.com/userfiles/file/86047564763.pdfIn PDF document text
    • http://anm-av.de/uploads/files/mebat.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/fusuroraxuzeji.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/kogaxekaruxabezipepuvoso.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/mexufizurimukezerativod.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16143226069ca7---21127896419.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/36231204214.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-09/images/files/norugovejaniduriti.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c6792c22a---51336989991.pdfIn PDF document text
    • https://denimder.org/resimler/files/19188494315.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/60538259518.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/9371471428.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/tizinada.pdfIn PDF document text
    • http://df-2.de/images/daten/file/10706417818.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e087b1111---vawolodaluwinetur.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/82664206319.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/rejodavup.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/lisusegiguforuti.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/73297484809.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/2021091607272683195.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/zozilu.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/ratede.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tuvaloj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=easiest+deathrun+on+fortnitePDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/rufabet.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_off0000fc68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC68 21040 bytes
SHA-256: 897c804eac3660f64ebffad22f2b64552e78198953a5b20590c9fbcc3ecd867e
font_01_sfnt_off000132d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014aef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AEF 10488 bytes
SHA-256: 65de1f11b7d8e308c6853f242db8ffbff7c48aa213f3f725d54c1d3ab2f2c5bf

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