Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcb3b687dbf8ee35…

MALICIOUS

PDF

69.9 KB Created: 2021-09-16 20:11:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 34690f751cc7c93943abb67508b5db0b SHA-1: 7673f49950e3e51cd66e7e15dc814cbc4b22f8be SHA-256: fcb3b687dbf8ee353b01e5eddd5168fd258a1320f9b61fbaaa6eca854a65fe21
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised or disposable hosting. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to host further malicious content or phishing pages.

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://laborke.ru/uplcv?utm_term=super+mario+rpg+snes+rom
    • https://ddshower.com/ckfinder/userfiles/files/morexixisemupovonowuvazow.pdf
    • http://urbanelect.com/userfiles/file/merafegegekitar.pdf
    • http://moyamoya.center/images/hand_uploaded/files/47185133055.pdf
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/78143478438.pdf
    • http://mylodge-naoshima.com/images/blog/file/rexozipofewabepijadalava.pdf
    • http://www.moyekolodin.com/files/48148148245.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5e02c0634---8220368547.pdf
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/pozojawusobesodanek.pdf
    • http://mispuntossaga.com/campannas/file/46883419826.pdf
    • https://sayurhijau.com/contents/files/22998699693.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161435f419a307---20530774619.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/4snflpil5u3fd0haaavhilof61/nokofituvududunawiwir.pdf
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/87331588760.pdf
    • http://baovethanglongmb.com/upload/files/65576844938.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/v26qljee3rooov3d84td4r9104/motazut.pdf
    • https://akilanews.com/ckfinder/userfiles/files/72452105551.pdf
    • http://lnianemarzenie.pl/userfiles/file/67001427496.pdf
    • https://paramourpourbebe.bettygagne.ca/userfiles/file/jufexexuku.pdf
    • http://i-p-p-c.com/ckfinder/userfiles/files/fuvunupimasubokizageloj.pdf
    • https://keluargamimpi2.com/contents/files/besekarefodida.pdf
    • http://factory-01.com/js/upload/files/72459984564.pdf
    • http://meandnetworking.com/ckfinder/userfiles/files/firigedaduzaz.pdf
    • http://problemconsulting.com/img/download/files/zorebutobi.pdf
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/1905601015.pdf
    • https://xn--nmqu14inmf.com/upload/files/tagax.pdf
    • 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_off0000b2ca.bin
d1a50ae20e52822438b8361cc5fbd145880a59af95e3566a85dfc60118eb7e2f
pdf-font-stream PDF embedded font (sfnt) at offset 0xB2CA 15420 bytes
font_01_sfnt_off0000da06.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA06 16792 bytes
font_02_sfnt_off0000f21d.bin
927b142918119b1cc2fbfa07596d7539bdac233c0ca6fa67b583deec22cf2a9b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF21D 10628 bytes