Malicious PDF — malware analysis report

Static analysis result for SHA-256 78eb56f4473f5f12…

MALICIOUS

PDF

72.1 KB Created: 2021-09-10 18:43:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 33661e24150002939fa9e905f71e4bae SHA-1: e9542b891ebea6764d85c0c63789952a3a5dc732 SHA-256: 78eb56f4473f5f124d4fe33727e344951929a81cba29c5fe3ed32ae7817e1e65
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The document also includes numerous external links, some pointing to compromised WordPress upload storage, suggesting a link farm or phishing attempt. The presence of embedded JavaScript indicates an attempt to execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://landatur.com/files/galeria/files/32323054837.pdf
    • http://davidhammerstein.org/ckfinder/userfiles/files/30616453537.pdf
    • http://technology-mp.it/userfiles/files/garamojosemarusakurofifef.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/320924ab07b784f964555a329c5ea5f5/88082783284.pdf
    • https://shoppingplanet.ro/ckfinder/userfiles/files/lovulo.pdf
    • http://sobateracota.ro/mm/file/fijopimowotadosomonab.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132381a4b8f8---44906225001.pdf
    • http://roosprommenschenckelfoundation.nl/userfiles/file/roroba.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/b2fdeqir6l19ijjueok98m763n/53510484338.pdf
    • http://www.corazondelsol.es/ckfinder/userfiles/files/11549651957.pdf
    • http://energy-labels.nl/userfiles/file/vubofedevopemi.pdf
    • http://wccflooring.com/userfiles/files/vogijulesoliluteveju.pdf
    • https://jagamimpi.com/contents/files/24876447687.pdf
    • https://securitydm.rs/slicice/file/luwiludibawutofawewor.pdf
    • http://ityab.com/cache/fck_files/file/81618196261.pdf
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/1677072574.pdf
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/wugedilinob.pdf
    • http://jandebruijn.com/uploadimages/files/jumanelevuko.pdf
    • http://cn-polylysine.com/d/files/63413733357.pdf
    • http://architettipassarinmarzotto.com/userfiles/files/70963280721.pdf
    • https://annekienlen.fr/imagesfile/19324785418.pdf
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/59805018143.pdf
    • https://mimpishio2.com/contents/files/vozavuvopugubuve.pdf
    • http://erpsamik.com/ckfinder/userfiles/files/gemunuki.pdf
    • http://goldsunjsc.com/upload/files/gelopuxodamumitoxuge.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=best+heart+rate+monitor+for+strava+android
    • 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_off0000b952.bin
df2c1d83ef03e1cc0e5fe34a72c0854fb0d9e423f4560bc8f9ec7d098a658974
pdf-font-stream PDF embedded font (sfnt) at offset 0xB952 16068 bytes
font_01_sfnt_off0000e271.bin
f5c731e2220b70e1c11225b42cda919bb2b1d76ee35a99a40d789047d8bda35c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE271 10692 bytes
font_02_sfnt_off0000fadc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFADC 16792 bytes