Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d4eaa228b790974…

MALICIOUS

PDF

80.8 KB Created: 2021-09-06 01:43:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e1f8c5f4b7210cc48ea5310412f48aef SHA-1: 4150420e2d25898588b7be47660eaa64ed802329 SHA-256: 4d4eaa228b7909743563b91d6b4301805815fbcd8b7027cd8ff1ae50e49c844e
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external URIs and links to various websites, many of which appear to be hosted on compromised or disposable domains. The ML classifier strongly indicates maliciousness, and the structure suggests a link farm designed for SEO manipulation or to distribute further malicious content. No scripts were extracted, but the overall pattern points to a malicious document intended to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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://archism.ru/uplcv?utm_term=manfaat+pupuk+kandang+ayam+pdf PDF link annotation
    • http://mediedil.eu/userfiles/files/61829259096.pdfIn PDF document text
    • http://finchamauto.com/pics/66825103969.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/13260202046.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161169b24b060f---favefuxewewozelinag.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/58870722685.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c962cd51d46---lelovoxom.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/bobovasunepen.pdfIn PDF document text
    • http://skomi.ru/img/files/file/98100546556.pdfIn PDF document text
    • http://denge.aero/upload/files/95332700531.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/sajoxugajakef.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea7d3e8881---lifefivasafepedode.pdfIn PDF document text
    • http://grandviewheightsalumni.com/clients/79364/File/14384890942.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/78135464181.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7ab32732c---vikap.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/fokatituwuxoloduf.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/negavukawabumilixoda.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/lexabaxetev.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/55464017664.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/caf798075f956e43cf4b5b32e48bc145/25285462787.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/nurinetivonivapaxuwude.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210620_717dc.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a280c704181---66333671365.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/usn0sgaic3hutept119h4f9sjv/64330901324.pdfIn PDF document text
    • https://unosms.us/userfiles/file/38071683944.pdfIn PDF document text
    • http://allseasonsbanquet.com/clients/868236/File/1867641505.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_off0000d871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD871 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF083 17128 bytes
SHA-256: 0c8bc228acaeeb1c792480bb1aad3837f98ad0742865b11ca24cd15e155af2bd
font_02_sfnt_off00011d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D71 10484 bytes
SHA-256: bb61413655a9c3614cb6a7fbacba10b8451515d3b07c430ad6378c4009277b94