Malicious PDF — malware analysis report

Static analysis result for SHA-256 16ab0e9f6547ff4c…

MALICIOUS

PDF

87.7 KB Created: 2021-09-13 05:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6560355a009dbfd329f358c1462efa2a SHA-1: caf7c0b8af7fb262729830fb6205bce8ab16fc33 SHA-256: 16ab0e9f6547ff4cd57723d28c732a70a057b85c61bbe27e7f182631b3e73d71
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The presence of embedded JavaScript and a link farm structure suggests it is designed to redirect users to external sites, potentially for further exploitation or credential harvesting. The link farm utilizes compromised CMS uploads and disposable hosting, increasing the difficulty of tracking the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • 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://ustunbilgisayar.com/userfiles/files/80039352734.pdf In PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/piralixomakot.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331d9fd5b78---23731566015.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/tabutoxuk.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/53792912176.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b74b7c6877---welofetesotewikikosi.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/93899580069.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/0f95f38e3ba6a990c721b312f1f116ca/36009472565.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/6334333084.pdfIn PDF document text
    • http://secretinvitation.net/images/files/dujizelimezigaxaforefased.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090816272626.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/26825308819.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161352faae61fa---rixokuvupadutegab.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/99777483636.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/xurilovepif.pdfIn PDF document text
    • https://toocapen.com/files/beliw.pdfIn PDF document text
    • http://lactopad.com/uploads/files/8575108771.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/fexegonusurigiso.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/bd2f478d685d2a0bea4dc8926cd49038/jifalupozedunawi.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/12905172602.pdfIn PDF document text
    • https://ikansambel.com/contents/files/vogaburisarolupiraxejanev.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/da99054afbf1ddc5ca12cd5955dabbd8/38022901455.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/13472917169.pdfIn PDF document text
    • http://xn----7sbndn5at.xn--p1ai/uploads/files/wopuwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=tweencraft+cartoon+video+maker+mod+apkPDF 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_off0000ef4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10762 10776 bytes
SHA-256: 6998966a132b1f826fb1b0785ab1507a3c7de0623db38f207c78a64ebe5f5d22
font_02_sfnt_off00012043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12043 18512 bytes
SHA-256: 565e2912d03ffd66ae461513a5d0df5ff9c75512b5446eb343654b9a317724d9

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