Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f8db1fa23f54fe6…

MALICIOUS

PDF

81.9 KB Created: 2021-09-04 04:35:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 093bdf9def01bb6629d9af20cfed23a3 SHA-1: afc093477d5948d109aa345ac2af51b8bb4d1651 SHA-256: 0f8db1fa23f54fe68409200587cf0a9b5958f22c4188213ee9fc9178feb368fd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://drafthe.ru/uplcv?utm_term=tnpsc+exam+question+papers+pdf PDF link annotation
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd68aba9e9e---44257017026.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210630081723.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/xedakotaginugigegelif.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/37899360106.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/6958061194.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a28b7002930---boverekivexiserironawud.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/vaxolojumivozanomikiwuju.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/d2d8bfd5946ed13723f3669a066f20cd/56514185983.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/fapovukekosom.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/70742152679.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/26412373052.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/losagivusunebib.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/a3380e06919248af3dc0b34a834fc0a5/nixewuduramolebu.pdfIn PDF document text
    • http://bgindus.com/t/tutorfirm/uploads/ck/files/47868522368.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/36008589800.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/98jfrih4t21pp3bcmkedj06sd5/55578146606.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/83647985016.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/30ab280a025a71654dc849e2801c368a/39679460342.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db445d525e3---79640342568.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094723c4ae2d---dogawomonowafufonaxeked.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/eaf068fa80bb216659e26d7b754b3dbc/pedapidaviteropisuxi.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0c03804e1---30925929050.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/99762443519.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/49017795299.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///monefitofatavipujij.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_off0000db0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f31c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31C 17456 bytes
SHA-256: 7bd9378d251857f2e17264279f28011945894da6f33001d11ce0a91468fc6cd4
font_02_sfnt_off00012063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12063 11044 bytes
SHA-256: a32242a67e9c6505230d306964c352f885a799c2fcb0b20a0bb0223e4103c6a1