Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e31c19181714dd4…

MALICIOUS

PDF

87.3 KB Created: 2021-09-19 01:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 06784fe9c62474a56e54c356e0d47966 SHA-1: d1b0b9096fc10debf5537cdf102c0ed0150d5ba0 SHA-256: 8e31c19181714dd45eff62ede590276d0046dd1eaefaa647a5a6c4aaa2028be7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm designed for malicious redirection. The presence of embedded JavaScript further suggests an attempt to execute malicious code or facilitate redirection. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://nomylo.ru/uplcv?utm_term=best+free+walking+app+for+android
    • https://pankajplast.com/ckfinder/userfiles/files/80590459340.pdf
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/71549156860.pdf
    • http://kayamedbursa.com/userfiles/file/61728333793.pdf
    • http://www.lovebliss.tw/UserFiles/files/rebobon.pdf
    • http://onelove.cz/file/zamukagajisazirapotinij.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/97bq95f210gn7cghp68fk6era3/41652212901.pdf
    • http://grafitym.kz/files/file/21685365261.pdf
    • http://gzxmbx.com/uploadfile/file/2021091717085073499.pdf
    • http://arkystudio.eu/userfiles/files/12176267541.pdf
    • http://analhospital.net/file/files/sedenojujalafixigemako.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/8ec999c24e6f3b2116ae16e4b22d0828/17895502747.pdf
    • http://tmkb.org.tr/ckfinder/userfiles/files/15613724361.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301e2f66804---39922415291.pdf
    • http://f-okinawa.com/img/tmp/file/9129606462.pdf
    • https://eco-translation.ca/upload/editor/file/xiwolaxuda.pdf
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vofapiril.pdf
    • http://thevisionkharj.com/userfiles/files/27816469702.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402c9b49929---79440803045.pdf
    • http://rungrawin-itt.com/userfiles/files/vagatizevisofikaxavixasa.pdf
    • http://mt-filtration.com/uploaded/file/1143944872614202f4e8668.pdf
    • http://yuhao-tech.com/userfiles/file/livaz.pdf
    • http://uchid.com/uploads/file/babulumebuzira.pdf
    • https://minipowerpack.net/upload/files/zasowegapusimolobopunok.pdf
    • https://bankkartya.hu/js/ckfinder/userfiles/files/zevapepo.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_off0000eff3.bin
3c3c2eb70c750d2d1e8e8a7d9ebc0ec1f0f69db41bcc28d6dfaa814c359dcbba
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF3 17892 bytes
font_01_sfnt_off00011e6e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6E 16792 bytes
font_02_sfnt_off00013685.bin
3172fed7fd4395dd6e3df5320db2fdb9e2fb8e4918fd78b27e4beb0ea3163b3a
pdf-font-stream PDF embedded font (sfnt) at offset 0x13685 10904 bytes