Malicious PDF — malware analysis report

Static analysis result for SHA-256 938af115cbe3383c…

MALICIOUS

PDF

84.6 KB Created: 2021-09-15 20:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: efd5719c4def25f48c71b6e20b42fb83 SHA-1: 302d2e5b9067755104c01ffa67afb1780d4ab2fd SHA-256: 938af115cbe3383cd3a779afd4927150c78013014fee154613f333041e81ec50
156 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as a phishing trojan and by an ML classifier. It contains a link farm with numerous URLs pointing to PDF files hosted on various websites, some of which are identified as potentially compromised CMS uploads. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://usairsprings.com/userfiles/file/9358232117.pdf In PDF document text
    • http://ministryofrum.com/memlogos/file/41628426587.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109100433171833.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/jilelarozosebapagatonigi.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/7532a5c8b5e5197469f9da7c75a77cba/guwevano.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/30903275741.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/92804823033.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210904011506.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/39116894205.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/zalalijafotak.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/libilalonuzu.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393d90d2ad8---63057223937.pdfIn PDF document text
    • http://sandlnae.com/data/editor/file/86762960446.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/sumoraxezivogazijadutuka.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a16803868---57471237525.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/dezeko.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/79582824587.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/89767248020.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/waleziwogilufedowejet.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131d4dad99eb---wesodoriwututefusolonorig.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/65484950940.pdfIn PDF document text
    • http://boldogelet.hu/media/93269371687.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109111948031228.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a076427fe---99574543748.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109080845062756.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/49385c7ede74dc5f76271bd7c1f7fc7d/lewulafuj.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/sigojifekizales.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=report+speed+trap+android+autoPDF 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_off0000e573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE573 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD85 18280 bytes
SHA-256: e087dcef52d7a932af9c1e0a3cf406c5a90f89dac3cd416932d78bee082a6b42
font_02_sfnt_off00012c25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C25 10484 bytes
SHA-256: 6ee18917ed29fe3fa8da435c3d0d25a767ae214cc10199b31580ff74e33d509a

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