Malicious PDF — malware analysis report

Static analysis result for SHA-256 e33243fa18f52fad…

MALICIOUS

PDF

86.8 KB Created: 2021-09-04 19:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7fca8cc83a670fbd44d495f9d9e2ddfc SHA-1: 3ba82b9a7c595d75a40075a228f79350eb078c07 SHA-256: e33243fa18f52fad48f32c004fe4bbdfc008f5ebbc471d3bf511af509801ec4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple disposable domains and compromised WordPress sites, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is unreadable, but the heuristics and numerous extracted URLs confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • 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://elektromig.pl/userfiles/file/41000714918.pdf In PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/vodozasibokar.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/5529abcbc76251e731dc79063bea8c3f/zepobebukefidizimugo.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/79422911772.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/57455832758.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/narebogitexatexi.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdfd7eaa81---kewefuzubofutuwi.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f598181e3---36637818115.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/sfjkaklnc8bfaaug1omq1u56hq/51252562963.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/sd4b4t43n6piiugaf0jugpc558/zosaluj.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/4f46ed645fc66735ff15512a12ac8ceb/labipunurirede.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/78832820628.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/vuwuwikojiduwolamimiko.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16093c1b4c4cb8---semizovokoravitufopitod.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/33da55ae02496cd24b1c5ecf0a2cf031/53044101775.pdfIn PDF document text
    • https://badrivishal.com/media/88204072376.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160860196ecb75---69107920081.pdfIn PDF document text
    • http://kotolantopeni.cz/file/12314060106.pdfIn PDF document text
    • http://simonide.org/userfiles/file/82198687012.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/86267529869.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/gon4a8or88i6uu941t53i2go8b/33900585401.pdfIn PDF document text
    • http://area5srl.it/file/vemoxoxawelitivubige.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/wilupefuwokabedim.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca5ed613a5---dovomaxuxeregapakezotira.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/22051682194.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/numipabupibes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=corteza+suprarrenal+pdfPDF 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_off0000eb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001039d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039D 10592 bytes
SHA-256: 1406201c882f7b5155ccbdec569398026975c8e2f7bcc92247dd77965d6abc41
font_02_sfnt_off00011c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C03 19608 bytes
SHA-256: e284bc5a5ae9a1672f986c311876ecd874d9fc363fe2a27f2a0ec6005e8cabce