Malicious PDF — malware analysis report

Static analysis result for SHA-256 8118fd69460588ac…

MALICIOUS

PDF

89.9 KB Created: 2021-09-03 13:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 491dc0d3e32bdb635be1885ed688cbe3 SHA-1: e95d913b604dd9375a2225b639f6354db320f949 SHA-256: 8118fd69460588ac7c8556d98c69da49879505b5da329cd04d7c3bc159f977f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://cructi.ru/uplcv?utm_term=reading+exercises+toefl+itp+pdf PDF link annotation
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16085823723bbf---ratulifubitekuguxeb.pdfIn PDF document text
    • http://soflcops.com/clients/83267/File/juxoralek.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/271l9587dm9n2qtf5m4orjnb81/68064306146.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db8b303035e---lolisamelibulimajaxa.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/30f545ca164f0c0b45f8dee7f19ffdd3/89191832988.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/dabigoditanenurupur.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce072db6c39---14020049021.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/nubexozaputikidamis.pdfIn PDF document text
    • https://sapsda.org/SapmaUserfiles/file/polikasokewag.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/fodusu.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/ff9f86fcfc9de679bdd2788d2051767a/xuwozirewivabivesaxunaxoj.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/43545796713.pdfIn PDF document text
    • http://zenithmetals.com/files/68730238698.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/safavel.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/vogisojuporevigu.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/16039963285.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/29183957148.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0e95feaefd---12921315512.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b40e9602471---18067561086.pdfIn PDF document text
    • https://edinburghpools.com/contents//files/vawusawagenopobakefe.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/rimowulibupifuk.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16071d16957ea3---86099195373.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/bigawuposepuripexefes.pdfIn PDF document text
    • https://bagstyle.uz/images/file/24067226261.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/22796653487.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7bcff3287d---bovuxevovememe.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_off0000fad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD6 17648 bytes
SHA-256: 582ac00f876f0d5d1ba1729d4f99e1b5961a9eba7830953231539ba919ecab23
font_01_sfnt_off0001288a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1288A 10944 bytes
SHA-256: 88ebf30a5c3f19ee9eb3ced5d378b03dad200f0b3a9f0364faf88d37191cc13e
font_02_sfnt_off000141d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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