Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ea0577a6f06c534…

MALICIOUS

PDF

89.0 KB Created: 2021-09-16 05:45:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e57865890fc2bfa33717253c75fc1a41 SHA-1: b28494a3efff51a8136654fdf32149d0996c0f62 SHA-256: 4ea0577a6f06c534edce165b22b0879dbf8421aaf0f581dc9a3c1ea04a020586
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or initiating malicious actions. Several heuristics indicate the presence of link farms pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish for information. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://creatinglifeoptions.com/userfiles/files/8920091093.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134222c9523d---tunepoxelumokedoxajinemo.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb345504f5---rojenufopemivavobupegeni.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/17291665451.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/67438357910.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/64817454217.pdfIn PDF document text
    • https://kawanmto.com/contents/files/70438852764.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/32669169279.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210914_5F8183278A7783ED.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/wofujopoxine.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202109160546297712.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109012245556051.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/62757670005.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/37468986135.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/xunew.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/94669963363.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/dumugaligod.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/91314674944.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/89313020226.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/49626786466.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/50163962802.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/99057157629.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/16455215501.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/sufosugikixo.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/jutikikiruxadibedenedube.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/64094462365.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16131f48e79eef---75718035380.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=watch+after+we+collided+full+movie+online+for+freePDF 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_off0000f5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C9 18192 bytes
SHA-256: 3e5dbeb31be1424ef23bb0f91949c35492382c3d722b4258fe3e791c3d9cec5c
font_01_sfnt_off0001250e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1250E 10816 bytes
SHA-256: 1307a57ff6ab57f0b5433217d57abaa7095af1904b6a6c276d6860946be36f55
font_02_sfnt_off00013de4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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