Malicious PDF — malware analysis report

Static analysis result for SHA-256 db18a5f041d7f73b…

MALICIOUS

PDF

80.6 KB Created: 2021-09-24 05:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6a5507384310065c254b11ae1c6ce9aa SHA-1: 47facec3ddb85cd53f707d32889e0c383b90e5fa SHA-256: db18a5f041d7f73bbd79fdafe22916f881b1b003c0928363b0ca1c0ba5d20849
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://abzesolar.com/uploads/files/dabajozuz.pdf In PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1f7cab26a---bamawalemow.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/gurepamozetowukosi.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/xuzuwapiwutuditonuxusu.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/50431428805.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/47017108906.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a25a76cc39---suwowozojote.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/52014940312.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8996ebff2---5777345719.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdbbbcfffb---82019356130.pdfIn PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/55177887533.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210922182528.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/28696547182.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/vobuperofo.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132510f739c8---5173858353.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/sogutenemewetuviraliwu.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/leritupe.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/xiwubuzevoxelubeze.pdfIn PDF document text
    • http://altronic.pl/!mag2011/userfiles/file/55583337558.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/14955103005.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/jazujipesi.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/17295332174.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/bazebamivuxogeneledutoro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=lego+star+wars+battles+pvp+tower+defensePDF 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_off0000d5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B4 10832 bytes
SHA-256: 9d26fbc60132ef853f8a7035854ee486e6463eed0742dd1e9149537ff21b196a
font_01_sfnt_off0000ee76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE76 18112 bytes
SHA-256: 8a0d877cd91beae480246de00fa771e6e1138e17e58e487c5ffa2562fdd77ba9
font_02_sfnt_off00011d23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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