Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dcbc1012f03af25…

MALICIOUS

PDF

85.9 KB Created: 2021-09-09 18:26:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 19b9397c05aa371ccfc49b293ba73cee SHA-1: 07b2d330c128cd18a6ba78babe191fd8b586f686 SHA-256: 6dcbc1012f03af25a801045d37ece0bff7708c055bed4641b20f2a817d151017
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicative of a link farm designed to redirect users. The presence of embedded JavaScript and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a malicious intent, likely phishing or malware delivery. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://irlanc.ru/uplcv?utm_term=redmi+note+7+pro+new+update+features
    • https://franchisefarm.franchiseharbor.com/files/files/mumixeg.pdf
    • https://bushregenerators.net/userfiles/files/kivirimisitipiw.pdf
    • https://ikansambel.com/contents/files/22673153817.pdf
    • http://sarljarry.com/userfiles/file/40521486079.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/000a7abcf01570cfb0c7df1ca98bf5cc/73816096265.pdf
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/rizewutowajobesowovof.pdf
    • http://vinhomeshaiphong.net/app/webroot/img/files/785197384.pdf
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/sowufujoxusoliwazejat.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/fc156908c9c196273411e6b6d61951b1/90675036412.pdf
    • https://ladachess.ru/userfiles/file/78757242127.pdf
    • https://vibangnhadat.com/uploads/files/mimuzirasapavi.pdf
    • http://verkaufs-akademie.com/userfiles/file/56912335357.pdf
    • https://vanchuyenduongsat.vn/upload/files/99146314383.pdf
    • http://qianxi.cn/filespath/files/20210908035116.pdf
    • https://tele-video.ru/upload/files/31876784548.pdf
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/pofimugerevasil.pdf
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/witelevikej.pdf
    • https://rijst.nu/userfiles/file/59427010307.pdf
    • https://tranthachcaodanang.com/uploads/image/files/12836802853.pdf
    • http://dierenwinkelindex.nl/images/uploads/mujibetubaduw.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613017b3f38f2---femiwajuvakokadu.pdf
    • http://pk.mo/userfiles/file/65873745492.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_off0000e27d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE27D 16792 bytes
font_01_sfnt_off0000fa94.bin
69d70abb55ebe6570c2133cca67b5c442fe501460538dc76dbe178856022bdcd
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA94 10896 bytes
font_02_sfnt_off000113e5.bin
e022431e9d7b7dd6671ef497422ef47459d1786e18d3510034ec4c16d6f9438e
pdf-font-stream PDF embedded font (sfnt) at offset 0x113E5 20476 bytes