Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9f5650cde81750c…

MALICIOUS

PDF

74.5 KB Created: 2021-09-09 10:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1ab51bf9ccf27f72f415a3f634c18508 SHA-1: c75d1fe44bad9145fe326f3e5400f864a4563364 SHA-256: d9f5650cde81750ceadea320dbdc839e1144af1ca91bec0461bdd3ee37465af2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://asr-net.ru/uploads/files/85324438534.pdf In PDF document text
    • https://asesoriagade.com/app/webroot/files/files/21286693250.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/22ca5489a6d8f39f21fe65fd3b01d9ba/71598403677.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/tidokaletabilo.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/57620514862.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/nukeninevibuwoxenarurumik.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/95690487130.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/bitiwipe.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/51394419972.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/140101ca77de1bd1462374310433fad0/zonigidagusuxofotixoz.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/sikozorojireguv.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/970d83ff4969e9f0d21624b1a8c463c6/52876892617.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/galotor.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/65646475025.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/ponidoloxuloluwejapuzum.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/88837227508.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/66590426865.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/8hu0s57294bkcn8ocnssil3c2n/bafedopugavove.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/wozeforerowe.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/49981799815.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/banufok.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/werajir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=words+starting+with+e+and+their+meaningPDF 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_off0000bf43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF43 17144 bytes
SHA-256: b14fdf9d196e632f9e1b5546128651bf74d82092ec03f235c3db25dea75bbc96
font_01_sfnt_off0000ebcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E3 10728 bytes
SHA-256: 01ddc1e84da32abd9d3cda4b98ba08c5e54241119aa3238c0c78606b08036abf