Malicious PDF — malware analysis report

Static analysis result for SHA-256 34648f631473b2d4…

MALICIOUS

PDF

70.9 KB Created: 2021-09-29 03:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9e27c51f627713ef10d11acd65444e83 SHA-1: d1537b81bfdee16be9c33ae65cb251692aaef879 SHA-256: 34648f631473b2d4843247db579b91e8bdc1e7f235e4247db35da8f4104e0c00
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised websites or disposable hosting, indicating a likely phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, with the embedded JavaScript potentially serving as a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://partroyfuneralhome.com/partroy/assets/file/lexab.pdf
    • http://avs-market.ru/admin/ckfinder/userfiles/files/7725984804.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161494e917f9f3---mikadigebafiba.pdf
    • https://mebelihome.ru/upload_picture/25200046685.pdf
    • http://banglatalkies.com/dynamic-images/cms/file/vetifapawipev.pdf
    • http://mitsubishilongbien.vn/images/ckeditor/files/94830705346.pdf
    • https://pro-biomed.com/admin/userfiles/file/76617686532.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614800ba488dc---3605141430.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161387afe2a2f5---13567217960.pdf
    • https://longhoang.vn/upload/files/70971254400.pdf
    • https://oxi-dental.ro/imagini_ws/53043698335.pdf
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/84905578097.pdf
    • http://ildongwire.com/userfiles/file/sotirowas.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e8aee620a---jurubaxebetamovadivukete.pdf
    • http://k85shj16h-561lt.com/contents/files/85513302096.pdf
    • http://muzycznescyzoryki.pl/userfiles/file/rekijefenugivesumovelez.pdf
    • http://antasboru.com/guvennet/resimlerfiles/kotesuxebofugukubijafi.pdf
    • http://tpokebar.com/uploads/files/nuxafigozurupowegesitu.pdf
    • http://hanasushichoice.com/uploads/files/77812708701.pdf
    • https://www.pu-sk.com/app/templates/js/ckfinder/userfiles/files/61533992730.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1615395c4012a9---siwesufuteruzejexale.pdf
    • https://hatinhjobs.com/upload/files/wapezezesonudasotimisu.pdf
    • https://hoangnhataudio.vn/media/files/pitorelatadutipap.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16150c13ce6a6c---nifoturojuxujusirazur.pdf
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/wasowibebojidiso.pdf
    • https://mamap.in/ci/userfiles/files/vujibageguzojaboruvozali.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614a24780d4f0---41334397326.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=google+nexus+android+update
    • 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_off0000b591.bin
2c592f8fbbef38b9490425f5cb992fceff1a1af145a4df6adb11b2ba1ba4fe13
pdf-font-stream PDF embedded font (sfnt) at offset 0xB591 15628 bytes
font_01_sfnt_off0000dd29.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD29 16792 bytes
font_02_sfnt_off0000f540.bin
86b252ac834c7eb91663adf2476216a44021d6cd0ba1edab936577647de8367b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF540 10808 bytes