Malicious PDF — malware analysis report

Static analysis result for SHA-256 03d6ee78d26492ac…

MALICIOUS

PDF

82.7 KB Created: 2021-09-01 20:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f49cc3f20c22df95b001948cf95f8161 SHA-1: a7017a9c00916c8fb95bc132dfefcf8c0c51ef81 SHA-256: 03d6ee78d26492ac0f45007262043414738b8bc45e2217ee22c250e400f89565
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress upload directories and disposable hosting sites, indicating an attempt to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to potentially harmful websites. No scripts were extracted, but the structure suggests it's a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 5

  • 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://akinmedikal.com/uploads/file/44482947434.pdf In PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c089cb1634---21962774460.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/57549356806.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089a68814ad5---miboxadewubiraligid.pdfIn PDF document text
    • https://alibabaoman.com/basefile/alibabaomancom/files/pudewaxorewafok.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/gowekubumutune.pdfIn PDF document text
    • https://immobiliaresancarlotrieste.it/file/27441202976.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16091ca8c251b2---bosajixin.pdfIn PDF document text
    • http://peaktoppet.com/ck_imgs/files/dorex.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/suwedaboriwawanidoluribe.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/82705013593.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/12590451351.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/8e01080733128af9c61175bf99a69917/60475964490.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/35hdcdst3f1gc7putdqo6i3pp1/wemanenuvexeme.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee6800a2088---55452415941.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/ponewipazebikubujorudu.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/42658148507.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/lilojononij.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/f9da787bab0b1992b1dd4a5f764e29d3/17237586917.pdfIn PDF document text
    • http://svb-volleyball.de/userfiles/file/wejitibelilogakupire.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/xexoti.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c690adf826---vugorenizojosekigu.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f72a24f14---38847807658.pdfIn PDF document text
    • https://bouwservicewinthagen.nl/userfiles/image/file/77955992722.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/6560541441.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=blood+blister+on+nosePDF 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_off0000e129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE129 17220 bytes
SHA-256: e9e0a142a4db7d1a6c844827747ec5b0ea08d838bbf0a34bfa0f4bece622ac31
font_01_sfnt_off00010d2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2C 10272 bytes
SHA-256: e5bef6212550a76393318678a28b6a65e20be304141f7b4d04bec562dbb58e37
font_02_sfnt_off00012461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12461 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1