Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae4b5b1735ab3540…

MALICIOUS

PDF

304.9 KB Created: 2021-07-23 07:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4febcb70c76d607c4596cb1aa573c3eb SHA-1: 355516d032309accedc7f8c1fc8d4602223f2a7a SHA-256: ae4b5b1735ab35408a7815db62677b0a62f20ca069565f9b82285ad21852dd0e
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links, including one pointing to a compromised CMS upload directory, which is indicative of a phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to a phishing site disguised as a free download. No specific family could be identified.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9894

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc18f5a470---dawumevusom.pdf In PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/vugujisudowokebokakasaro.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/398b2b26d332fc2f2470c15bd0a19cc3/jejewibi.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/9ace6832e64f3c0da09666af8395df39/68555570851.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160712655411da---baxopefapowili.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b271b123b---vebapubonudarezemofu.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/59a1cf5c4c9940c55d43528af055e268/13933261313.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/27278752908.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/lujomozetukotatogunej.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/1a88e8ea90110e642618ca175bc0fd34/bikisepibopoped.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/60474560858.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/gewokilifikuvezululuxub.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d5bcb334f---jubanaduvalafofe.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/518aaa4f53bfc6ea4bb5d004d9af26de/torogotorawatefawe.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/najujuritojenavamuv.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/86893117623.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/lolobobojijotuxigizov.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/0feac413fe1fdebabe43937e7a4d19ea/27861909292.pdfIn PDF document text
    • http://topas.lt/userfiles/file/vexevugemivepedasaf.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/gowuniveponusizavura.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f33e19af3c1---76820993557.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/91691273446.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=petitionary+prayer+definitionPDF 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_off00044d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x44D01 10392 bytes
SHA-256: 6f4f6891fba19330b691de497487a9b57669aa3b1b4001e73656475832c3a505
font_01_sfnt_off000464ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x464AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00047cbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x47CBD 21072 bytes
SHA-256: 579262481553af91eb871d50b48be485b761d18275d8782b8a23133045ca502d