Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d85949584e171af…

MALICIOUS

PDF

71.8 KB Created: 2021-09-19 14:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 36833348424005025a2b882cdb5e6e99 SHA-1: 4b51c41be06c7f9e57b18c871ed008bb7880a500 SHA-256: 0d85949584e171af4c4b865647af7548117a30a76b4242e803b9941d2f0fd1e1
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://garglob.ru/uplcv?utm_term=free+file+manager+apk PDF link annotation
    • https://almondzwealth.com/administrator/imagetemp/file/2141888860.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/lanajimowukowatidas.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/40866902348.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16145587c313b4---18648525778.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/loluwizamojogeke.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146cab318b78---lobefeguzowe.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/zepuxumafegezeruf.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/zawikubatepol.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/bedijig.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/lokuxutodinuzelubadis.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/29887122655.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/60466434021.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/34552678443.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/76817903830.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/56995907249.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/79700924861.pdfIn PDF document text
    • http://uteambio.com/upload/files/52362504988.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388a8d910ad---55195453693.pdfIn PDF document text
    • http://evola.it/userfiles/files/jawozixekovobukosofu.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f26c0a6e0b---54860332664.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/famefuwewepodifabi.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/82531503510.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/58003444135.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132cfc15fc13---nezuviloxexolemiburigolu.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/ipe80ju39pp6ni458rbf0rdgq4/bogit.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_off0000b8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D8 16212 bytes
SHA-256: fd350f7cd3916a64ff528e633e70fd56c6088c9865e043dc7d185523689536e8
font_01_sfnt_off0000e24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24D 10384 bytes
SHA-256: 8b17f2eb7feb622db9f30b29824e748029f6ff57f4437762457ed80a447e5e19
font_02_sfnt_off0000f9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1