Malicious PDF — malware analysis report

Static analysis result for SHA-256 c08adb735876cacf…

MALICIOUS

PDF

85.8 KB Created: 2021-07-03 09:56:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 83e1b12df3acf52ca32304bb85f32f57 SHA-1: 8bc74ec7c3e093fcf07b488aad0d51b243ffd241 SHA-256: c08adb735876cacfc5147f96a3a54d8fb3979f040ec17567994fdbe7d04eb254
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious payloads. The ML classifier strongly indicated maliciousness, and the presence of numerous links on disposable or compromised hosting supports a malicious intent to distribute further malware. No scripts were extracted, so the exact execution method is unclear, but the overall pattern suggests a downloader or dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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 http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b56aa8aa28---12477425653.pdf In PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/ba87e36a068bbab2af47721031dda249/22401011362.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/767c588889ca76bbe5c30b878ecff6af/52870488788.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079fa069daa1---renufowerojogof.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607141e2b3b53---munomewowavepedosarexagot.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d092865788---daderalamifowolejub.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/zadowaluteluzepakined.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a28c18bdb---47754408920.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090322163fef---demogatopujowe.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16070c42e376b2---37534860989.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b368248276a---zisulodepas.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///35035881250.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/4v7fsp63qnqocdbuh8h2sidug7/laletid.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a4297f658---xexosofuwatolewed.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/378a4d7c59058aaed4e7321b5a84a914/pupebogizamugedaso.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/cjopqfei21t2i4452rcn49r462/82276753435.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094cdcaa5678---82647240455.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/14576761162.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/gijikovimofiwilekap.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fc06574ba---53700712225.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160929745da499---57985976804.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/56100301651.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/8rvkjt3f038suifdd9t4v50cr8/81658952206.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=one+of+the+stages+of+alcoholismPDF link annotation
    • https://mediaget.com/userfiles/files/48459672606.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_off0000ef2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001073c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073C 16416 bytes
SHA-256: a2734b3383f2a299be29743b07520fe72dd5cc60aead454ac52b2c7457289f9d
font_02_sfnt_off0001319b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1319B 10708 bytes
SHA-256: 451ba8ac24274e3af6367cada78bad526a60cb31a632170e5c344e913f96c238

Open this report in the interactive analyzer, or submit your own file for analysis.