Malicious PDF — malware analysis report

Static analysis result for SHA-256 b47ea79c02358748…

MALICIOUS

PDF

87.8 KB Created: 2021-09-02 08:32:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 14a750134318567a6aaf18bf12cd279c SHA-1: ac7f2af36fd5c25871e86649e004c9fff43e44e9 SHA-256: b47ea79c0235874834ebf0c153e2011dd71950b297d33a2e604d7fda0ca11753
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to compromised CMS upload storage and disposable hosting, likely for phishing or malware delivery. The embedded URLs and the PDF structure suggest an attempt to exploit vulnerabilities or trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://alkanboya.com/files/file///litugowobegif.pdf In PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607518ea57662---96284068631.pdfIn PDF document text
    • http://qishuochem.com/siicea/userfiles/file/29106923296.pdfIn PDF document text
    • http://sin-hua.org/userfiles/wupalaz.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/43524230594.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/79929435399.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/54006392638.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/hlvic097v7lnjr1sp8gd4b0p6v/neporasafu.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/40382070327.pdfIn PDF document text
    • http://donghotam.com/luutru/files/96135275294.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160981bc4bcfc7---safoj.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077cea2ce6f4---kotexuxuvokalet.pdfIn PDF document text
    • https://nanosoft.mn/images/content/File/56775378278.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a1ffcf242---dajututizefotapiki.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d8a6a3739---fitavidaxewexoxifozijival.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/8285832098.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/81477161447.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/40551002526.pdfIn PDF document text
    • http://amandamaitland.com/images/file/faxufevagusipilekakuliwi.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/2290055447.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/ruxekug.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/xadigufu.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/b3bd0de7e9899fd0c3c2355fff993327/batevikowaluvori.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7e8b51597---zosukabopo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=worst+water+pollution+in+the+worldPDF link annotation
    • https://medlineplus.gov/waterpollution.htmlIn 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_off0000f2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EA 17452 bytes
SHA-256: 1075c32118461203c03c30567380ec8458f1d128fd9aefe4a8cd27e06e2eab9d
font_01_sfnt_off00011ff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001380e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1380E 10668 bytes
SHA-256: 22ac60843299438b82357ff76ab5be0a258f266c908da1a484ee29cb803392da

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