Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e91342dc949dafc…

MALICIOUS

PDF

71.3 KB Created: 2021-09-12 13:14:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2b0126e83a3f574046d0886d9889e11b SHA-1: 74eab96638e5e870e0452977d341b0c11cd611ef SHA-256: 4e91342dc949dafcea51b0e56c38b5eaa2dd1d03bfc9ce2468fbaea7134ffe03
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting it's used to host or redirect to malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure, likely employing T1059.007 (JavaScript) for exploitation within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/161394b744f948---65386211724.pdf In PDF document text
    • http://linuxnewyork.com/draft/media/76938001104.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/48694322277.pdfIn PDF document text
    • http://innersolutions-uk.com/file/95054251067.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/40058747120.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/pegivafuludemenu.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/39823181914.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/7383004551.pdfIn PDF document text
    • http://www.polni.si/Images/files/monuxewozebepibu.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/22298021005.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/xelotarin.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/43575231347.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342819e2175---46304850585.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/sedmthgjiof8pumc2gace44aj6/77221882268.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/gf90etc983fao22vb14ml3jjfb/18233480102.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/tedofu.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/97515242216.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/tapizikosikupa.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/80528484431.pdfIn PDF document text
    • http://quaisetoiles.fr/img_pages/file/midofugunobasixawojara.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/fukewurorunojo.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/p77apcshpvge2iraiptfom1otn/gabik.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/5pu1e7tibdocij8o2e3bg4640s/54263371742.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=u12+soccer+practice+plans+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_off0000b7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDE 10792 bytes
SHA-256: ec10ae174dbae704d8677b2f50c7c533edc16164fa83b57708d58e623360b711
font_02_sfnt_off0000e8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EF 15488 bytes
SHA-256: 013de06c978e1b3f03f4343bd54c3580fdf9b5dc210000af2e9399d511f4794f

Open this report in the interactive analyzer, or submit your own file for analysis.