Malicious PDF — malware analysis report

Static analysis result for SHA-256 d950908e3d879d87…

MALICIOUS

PDF

84.3 KB Created: 2021-09-08 07:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 412ff84642b4695658032fe5cc0e7a09 SHA-1: 1af54a74bdf16b16083a4e2bfbed0c5713f3b755 SHA-256: d950908e3d879d873929396b20f257b3f169f20b88996ac8fbc3a9b66d655acd
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is unreadable, but the heuristic findings strongly indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=air+pollution+in+urdu+pdf PDF link annotation
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/75884158650.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/65699678548.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e3bf70dff18---ladanofuzufiwufezomovukub.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/57931734813.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c52707c7817---risalif.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/b380350bcbac30a26be4010f10e63b82/bazujejexibuz.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/xajokurifoxiwagur.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/90859611270.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/ca77b3bb190ad8178b234452cc85c082/majosoperutole.pdfIn PDF document text
    • http://tavio.su/files/file/jewawetalapadagajuguxowu.pdfIn PDF document text
    • https://iwistw.com/upload/files/vaxofufoxexodigorerune.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/binisamuludok.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/belifazidanoxamuwikef.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/najubusodunorimetev.pdfIn PDF document text
    • https://moiatakashta.com/userfiles/file/fojolulokabomomifo.pdfIn PDF document text
    • http://ymmicro.com/files/files/lirifavodubosi.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1622789362.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/eed43ed7f109f8aa1ae37389a7be32fd/21190690548.pdfIn PDF document text
    • http://toyotalongbien.org/data/dulieu/files/86617943116.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/borenaduputepami.pdfIn PDF document text
    • https://hoalavender.net/upload/files/difobinezilopotofozakime.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/zomebowopos.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160785b52c7cf0---15352214778.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210606_03F61FA960C10736.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_off0000e3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF4 10108 bytes
SHA-256: 248fcb2a02581ebd7e0592874d15980781c99ce7272269a385e25b547c420b5c
font_02_sfnt_off00011283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11283 19288 bytes
SHA-256: 6965475004c3d70bc501df2bdd1999ab699ab795427342223f93ff23ff6bc201

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