Malicious PDF — malware analysis report

Static analysis result for SHA-256 1626c951f56bfbe8…

MALICIOUS

PDF

83.6 KB Created: 2021-07-08 00:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 82df4615397bcf9bb8e35233370a1071 SHA-1: 4e560b10ecbd2085e497469f5e78e4d389fcd551 SHA-256: 1626c951f56bfbe8f64932f3ff9cda8c5877b59b18be9bc49447fc26bbbe01c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, pointing to numerous distinct hosts, many of which are hosted on disposable domains or compromised CMS upload directories. The embedded URLs suggest an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://abeess.com/userfiles/file/72601994422.pdf In PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/mumovixavobo.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/4cc092ef8c5ef24fda6fb6d4bf5bf386/88713640589.pdfIn PDF document text
    • https://belloverde.net/emailer/file/25085369879.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16071eeed2b92d---52880653580.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a48b66568b---80017100843.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/cba7f7e1ab1af4484e97d5c1d16a86a9/11859991500.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/c3914c84235d66695997633cf0f09b20/84786191935.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/99825300164.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/pideviwevirulujosixud.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/xatenokosunoxiduka.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f89a92ee2---zizufe.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d736acbe5f---salezinit.pdfIn PDF document text
    • https://impactcleaningserviceskc.com/wp-content/plugins/super-forms/uploads/php/files/b4bab220bf6a25d579531364e4920c28/14856072192.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/ketadl0r1sb5bm675i7jo70ov9/gepadoziwakunofawutimoz.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9fb885a25b---73758111444.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/zoxugasaroteteliluwumimem.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/97252109564.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/dc2032b24f8c5be0b8995e77d5e31530/kepatupolononaruguzenitex.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764c007da0f---wusovevosivapege.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/49362906753.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/mcb9i4gq3nrv2107rhpgh1gaa2/5678375814.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/nazetutenexo.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/narimexidukasarijetavogu.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/f9dac5c0296a02230d9b8a97696daab9/53082696908.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/90668248474.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=what+is+a+strategic+resourcePDF 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_off0000e4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B1 10452 bytes
SHA-256: 8c664ed388c370a5d4ee8a753dd245e8fa7d589c79a8d2a479d37daefff804b1
font_01_sfnt_off0000fcaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BC 17068 bytes
SHA-256: c01d2673feebbd80fdbfeb20386a6679d1b4c1acc7e890748706e97c9c465b4f