Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa45a99b67fc2700…

MALICIOUS

PDF

82.8 KB Created: 2021-09-12 12:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 553d9df8b4c67f52a1078594d4895f34 SHA-1: ddc90c5d3606d37307dab8db399a6b013edcc08a SHA-256: aa45a99b67fc270070f6caabae8e937761f43b6f29a96d2748b8c9228a5d3510
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites. These links appear to form a link farm, likely designed to distribute malware or facilitate phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, with the embedded JavaScript potentially being used to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ca1668829---54160008407.pdf In PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/ditoxuvigirobusama.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/bemopubabopufox.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3b95a1a7f---25103419074.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/60205216692.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/kabax.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/20104303943.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/xowenu.pdfIn PDF document text
    • http://loaamtran.com/files/usersfiles/files/72691016764.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/tikiru.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351b4cb77fd---55518559012.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/1560341580.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/kemokemowenerala.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gilinuwamizorudekugaz.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/wogeratupexodapib.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/72678901244.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/pemuwobolikosafizi.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/33590641715.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613d14a10b175---vosamamibofusukuwe.pdfIn PDF document text
    • http://safetruck.gr/images/file/fozujiroxirezazajumumi.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/72446000972.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/74680678573.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=dota+2+mobile+apk+downloadPDF 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_off0000df89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF89 10724 bytes
SHA-256: 01800f712df7b9504574fd135478ded36bc6a2d721385f7cd365a84ce72470ce
font_01_sfnt_off0000f7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FB 17796 bytes
SHA-256: 7f822de8b6fb64c03db318e242c6703a250b76dbb6788054e5b6afc38640f3ac
font_02_sfnt_off000125ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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