Malicious PDF — malware analysis report

Static analysis result for SHA-256 6048aaed3c925a17…

MALICIOUS

PDF

74.9 KB Created: 2021-09-19 15:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 765882677ae2943180d803eccc739f75 SHA-1: 6b0d6f64a29fdfd8227a66d22a3ff63d0b923bd2 SHA-256: 6048aaed3c925a1735adfa95547f8b52b71a55be5e20ce1f693a20546591e876
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites and other unknown hosts, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL distribution are indicative of a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405b8dd8a4b---gomimaxeme.pdf In PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/24173894323.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/54506204346.pdfIn PDF document text
    • http://zoop-tech.com/ckfinder/userfiles/files/30773752891.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/fevezisago.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/8c35bfb7012b9b08c7ef9745b49a0f9c/77204939775.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/72001727679.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210910181926.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/3448601788.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/72459774344.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/63050513854.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/1811587114.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebd9051119---tulorasigil.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/lefosateretigikebop.pdfIn PDF document text
    • http://net-marketing.hu/images/files/doradudexatonuxorasuri.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/0508034232aed40817dd410b1ebdfd7d/7177241569.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/wokarikadizoba.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/59475599948.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/nurebu.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/6053536655.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/56983242458.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/52469110941.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/53595752895.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=gta+vc+apk+litePDF 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_off0000c23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC23C 17456 bytes
SHA-256: 89e75318577d5487e28ab9aab07dc0db94dbea602db164dcc494b8777919fb0d
font_01_sfnt_off0000ef56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF56 10072 bytes
SHA-256: 369dca1daf0103bbf45446c13d48503fd303e0b894c3671a3a83fa7cd4a478bd
font_02_sfnt_off000105f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1