Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd733dce0fb7cd47…

MALICIOUS

PDF

116.4 KB Created: 2021-07-29 23:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d71be8c72a4f3a0da4ea180f159cc59c SHA-1: 4da2689bde9f685e364f57ca98b83e5f4e6e1f4a SHA-256: dd733dce0fb7cd47491c7166dbcce4687078d58d8a75492ac91b12734672b34a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is part of a phishing or malware distribution campaign, likely leveraging a PDF exploit to execute malicious actions or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://philabc.ru/uplcv?utm_term=does+chuck+die+in+the+maze+runner+movie PDF link annotation
    • https://oklasik.com/ckfinder/userfiles/files/73337928254.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1b8838261---jebixisisugagere.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6419913c3---50817844110.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098c149a7ae0---26279736318.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c72fc1cb08f---fopogebuvelufibero.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/55089410939.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c10983cc677---23111840182.pdfIn PDF document text
    • http://atya.eu/files/file/96556039509.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/23c705ac0e704d952a16a123fa39826d/79690035330.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/zozomofo.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/lumixosapowejowupukita.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/48945543826.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/d96831cb3e537c8d9b2f14cc46717b82/63155376551.pdfIn PDF document text
    • http://heureka-cz.eu/files/wadijo.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/xepevekivewimo.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/elovjs0kpo1d63g7h2ao5j9rq7/sogegitetidufasune.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/jogetikosabebuwa.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4c1dc2bfa---karumasikonujajizifojami.pdfIn PDF document text
    • http://faradbox.pl/files/file/46909410899.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0ae71d989---17271259424.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083040f691c1---jedirubijasogipur.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/2913255617.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c932eecf4---zogopawagazex.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021042906313773499.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/a431bf419c4e47846de1276d34122bcb/39355926218.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_off00016237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16237 17756 bytes
SHA-256: e558f68121062f843f41ccb0277bf2c84c1bb1746429469bdbc161df98494837
font_01_sfnt_off00019111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19111 10908 bytes
SHA-256: 40b840182a05e0f4c88196c41380dc9202804492669c0a312b36db1599dfac26
font_02_sfnt_off0001aa34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1