Malicious PDF — malware analysis report

Static analysis result for SHA-256 d35d2a81631ad65f…

MALICIOUS

PDF

84.0 KB Created: 2021-09-22 14:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c0c8839bb539f98d82a3069ef9679254 SHA-1: b7d56395d54eb065de6ef1f2d4de82d630cfa622 SHA-256: d35d2a81631ad65f73c20354f800c9d613a96da576e4afb6f949ab4b0781ad8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or redirection scheme. The presence of external URIs and link farms indicates an attempt to direct users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://exhibitionchannel.com/upload/fenanem.pdf In PDF document text
    • https://sadex.pl/fck/file/valimove.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/xuwobiwilosuwelibatutumi.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/jujixarulomexudarimul.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4382a97de---80052256522.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/83590434050.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/3fa9o2kikptvg0tafliju320su/tixifuvak.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/rebiwafijuwup.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/xemimobe.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/lasidebudidugopep.pdfIn PDF document text
    • http://analhospital.net/file/files/70067929163.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/66c61c257e593d94801c12ddc0ec2260/84826169483.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/79470027334.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/98185571116.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/qgr7i5mbhuf3pcu24a390gqef7/tagunemejijunurip.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/05coqc6ft9l5jj5uvd3lpulug8/rimijevamexefiko.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/81623359544.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d583ce39d---93396191011.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/lipopan.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d77c5cf710---76256507275.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148a06f6220b---49648542695.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/64728563194.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=real+football+manager+android+apkPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/nitelusapumimenaduvitafim.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_off0000dbe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE8 20200 bytes
SHA-256: e0d606e0ca4a16d018fedce7d58362bd4609a1b22777ff350ab5ea3f2123d02f
font_01_sfnt_off00011119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11119 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12930 10952 bytes
SHA-256: 6e226326b171d22727b82486cbefcdf16636c7d7dc8a83bbfd816b8b9dc540c0

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