Malicious PDF — malware analysis report

Static analysis result for SHA-256 daade09ddec23c56…

MALICIOUS

PDF

84.9 KB Created: 2021-09-19 22:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0ad3ff220e9d01a6847d82d1d35abe58 SHA-1: 11bb3de6d9ec4d2292717196c012841aa3c65676 SHA-256: daade09ddec23c561595eb3c4ab1ae911bb69f5c9b68c56526235124d70d73a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://smidgel.ru/uplcv?utm_term=my+phone+apps+are+not+working PDF link annotation
    • http://pphjako.pl/userfiles/file/25843454260.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/99217972996.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4ba93f3fe---sipoxaledoxirufu.pdfIn PDF document text
    • http://xenangheli.vn/public/files/namajunemiloti.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161465ed232f55---lozibulusodukumig.pdfIn PDF document text
    • https://profm.hu/files/file/lamojaxik.pdfIn PDF document text
    • http://koala-al.com/d/files/fitadejafifosukitosol.pdfIn PDF document text
    • http://topoint.net/userfiles/fckFile/20210913071237.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/segonoso.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/f798177607682e62ffe2111b45039656/310801002.pdfIn PDF document text
    • https://sambelteri.com/contents/files/rasimejupop.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137e3b27290b---56173184096.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/16987246404.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/15107895121.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4e1c0e64c---wilufotefep.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/89966980889.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210919_81BBD72DFB8C8E99.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/laposobutipiwojaza.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/63834128792.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/98421281254.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/33952000284.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_off0000e4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F5 10768 bytes
SHA-256: 647f8ffb8fd554f14e582a65194955151d4db198f1ec3c971dbd034ce16a7546
font_01_sfnt_off0000fdcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCD 18432 bytes
SHA-256: f02e2fcddc5927020e4c14459bc2ae5f1ab88b1cc8a2de53b6c0ed424933c260
font_02_sfnt_off00012df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1