Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b84ed9fc7a89a28…

MALICIOUS

PDF

74.0 KB Created: 2021-09-28 00:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 693bb4c6b07519a0f92768fa1d86b6f9 SHA-1: 163d55b7e3ace0e0f6ec28609a25c70878fcae4b SHA-256: 0b84ed9fc7a89a289b69c5a16b085246fbe9fae4e332dfceeaeee97559b76a60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://pixomot.ru/uplcv?utm_term=lightroom+mobile+mod+apk+latest+version+2021
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/17333643628.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/f74b94f39843dd23b95356bcd85eb0cc/8427222183.pdf
    • https://lideregitimpaketleri.com/calisma2/files/uploads/vadozuzapowu.pdf
    • https://101doctor.com/uploads/ckfiles/files/613eafbdd89cd.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb7ab00003---43816181165.pdf
    • https://liguecasa.mmsfoot.com/stock/file/xokuwizobilexawe.pdf
    • http://ch-bovi.com/upload/files/rizolon.pdf
    • http://sinsg.com/files/fckeditor/file/xafakejejukovivuf.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e23031f60c---jujejibowonamokuniw.pdf
    • https://fishboat.hr/files/70517494612.pdf
    • http://deborahkay.com/ckfinder/userfiles/files/fezodotusefodozusam.pdf
    • http://korea-labels.com/ckfinder/userfiles/files/jedasatewigejakuruvulufe.pdf
    • http://bmcnx.com/userfiles/file/tulonajax.pdf
    • http://turnwealthy.com/ckfinder/userfiles/files/pajugetoluxofanuzidawu.pdf
    • https://institutdesante.org/userfiles/file/netiretosuserumufogikuwok.pdf
    • https://rachelrom.com/rescontent/file/23151387520.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130903b72464---95859090603.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161425995d1826---68286727928.pdf
    • http://eakqshop.com/ckfinder/images_store/files/41733296113.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/17m6m2ers9v82lvmh64eig8s5p/zavokodiwuvajekanimoziluj.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/99f54aee199caeb8f864ffb3ac1f626d/99636543490.pdf
    • http://bsinteriordesigner.com/userfiles/files/figakifovifimo.pdf
    • http://mdtrend.hu/files/file/13838001782.pdf
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/venediximosezigotow.pdf
    • http://baovephuongtroi.com/vietkiendo/upload/file/46303681612.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8a8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A8 16792 bytes
font_01_sfnt_off0000d0bf.bin
955c0d9dd9507016113f5de1f36d0038832b949747fc3c836f03b3308f76bd6b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BF 11388 bytes
font_02_sfnt_off0000eb0e.bin
0b3664cc0be8ecc84c6447d4d8dfef771874f93eb7e04aba389ce75a56be41a0
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0E 17452 bytes