Malicious PDF — malware analysis report

Static analysis result for SHA-256 e093c1460dc4c479…

MALICIOUS

PDF

71.8 KB Created: 2021-09-27 00:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5f601b89e994d980b70ebf123956a68a SHA-1: 04ee08d5d2690da1387ee6a7900e297676e1da30 SHA-256: e093c1460dc4c479046dad72fde78918d6f6167f60ba62224502333a490adf7b
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous URLs pointing to compromised CMS upload storage and disposable hosting, suggesting it functions as a link farm to redirect users to malicious content. The document body is unreadable, but the heuristic firings strongly indicate a malicious intent to host or link to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://huntic.ru/uplcv?utm_term=bubble+shooter+legend+apk PDF link annotation
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/revajuxizodawak.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f038c43cb1---99218084543.pdfIn PDF document text
    • https://kalendarz.probik.pl/fckeditor/userfiles/file/93669376947.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/6om04pscqftqep1c7m99r8e5n3/51009323007.pdfIn PDF document text
    • https://aurorabersinar2.com/contents/files/barodaj.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/76518169041.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a113225e67---72945750369.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/tozizajogep.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/41617035418.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-9/20210909221535656753.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/57289357659.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/47249189145.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/lepetifulogaxupodatose.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/85063267096.pdfIn PDF document text
    • https://mhreng.com/userfiles/file/87027842963.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/dizekow.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/22499516141.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/77986410881.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/wuruxijunopugexolilovog.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/32981088976.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/dasifexokezukopelukiba.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/37468986135.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/81785083939.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/wedamuxajaraxineno.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_off0000b248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB248 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5A 18048 bytes
SHA-256: 9b4d47b1a6636ad38a39197f63b0b8d09b4248b839df2beb967e8689f5c91650
font_02_sfnt_off0000f902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF902 10964 bytes
SHA-256: 2395b9929ca4635fcdfa9493d4a7bcbfd57bedcf33d6200197725f16594b514f