Malicious PDF — malware analysis report

Static analysis result for SHA-256 601b03743e09f346…

MALICIOUS

PDF

86.0 KB Created: 2021-09-23 19:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e9a498bed5b750c5ae0255f5384810a9 SHA-1: 544618ef4757699fab4b5d68e42682b603c7f1ac SHA-256: 601b03743e09f3468168e8f39f8bbca48f29e6051fa4b1ee4daf0c602933b0d0
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external links, including a link farm hosted on compromised WordPress storage. The presence of a 'download button' lure and the ML classifier's high confidence score indicate a malicious intent to trick the user into downloading a payload. The ClamAV detection further confirms its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/uplcv?utm_term=moana+full+movie+2016+free+online+watch PDF link annotation
    • https://tailormade-sales-marketing.com/userfiles/file/27025077111.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210902222859.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/gefilufaxixazulisipeper.pdfIn PDF document text
    • http://twilaw.com/files/files/jetuwakabuzemitufoturepab.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/cfa30661152294bf8a0033b08905a967/wonolujimus.pdfIn PDF document text
    • http://freewest.at/85180771432.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/21084789640.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/ranibomavavuxez.pdfIn PDF document text
    • http://tonghuichem.com/upload/files/jebuxuxonokamavi.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/komigexosolo.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/japokidosaj.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/79593513304.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/76949533845.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16137df4073935---49001810884.pdfIn PDF document text
    • http://chipgene.com/image/files/20210903_081004.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/71951889462.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/xazovekalineremafe.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/35403635464.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/wawitewof.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/9699500582.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/13970823246.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/1a432ce96fa309ec0a08817223cc3911/xatijufuzip.pdfIn PDF document text
    • https://hung168.tw/UserFiles/files/dexudalezobilekoge.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16142dd7d5d519---repogobigupa.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/98344460083.pdfIn PDF document text
    • http://qzgj.cn/upload/file/xupirarugogusubofum.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/fabimagiziv.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lvl45hpujv7b84cg50h1n8teb6/25659154994.pdfIn PDF document text
    • 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_off0000e820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE820 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10037 11140 bytes
SHA-256: 5c89855dc4613ea63d73759ca08e40591349697b047d96a0dd383e1fe5f866be
font_02_sfnt_off00011a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A30 18284 bytes
SHA-256: 505f76789caa8857e344f3f6a554b9d68b61a81aeb8e2163356cc545c96c7240

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