Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d146d95104d7b0…

MALICIOUS

PDF

79.8 KB Created: 2021-09-16 23:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 01a75f29f366f0368a3aee02bdd1d70c SHA-1: f39ea542648f1c6fc9047b2bb5ae8518eb18c1a1 SHA-256: d8d146d95104d7b08afb3a4cea1ce47ff568cb211fea7f92985d53fd37eb2145
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised CMS uploads or disposable hosting, characteristic of a link farm used to obscure the final destination. The presence of these links suggests the PDF is intended to lure users to external sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/161400a695d400---nekuguse.pdf In PDF document text
    • http://hcstonetw.com/uploads/files/202109031405408672.pdfIn PDF document text
    • http://zenkatsu.dk/files/84465415857.pdfIn PDF document text
    • http://poliinc.com/upload/files/wijovezegubodotu.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/9784205171.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/dudivikevuwamanuvobon.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/14c002f8f9f3fa25adc93ea30b057418/27496437851.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/8a6cfdcc2395c245b82da1c0dfe81cd5/zagorudelew.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/78588918466.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/161334e488f7bb---dalutakix.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/wobeva.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/88854895067.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/4806695582.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/pebafukuwesexule.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/mutafujalufuv.pdfIn PDF document text
    • https://sentralperdana.com/file/84646167763.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/74295455219.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/79703047393.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/43412768732.pdfIn PDF document text
    • http://word.mn/uploads/assets/wuwuzalomiwavodigova.pdfIn PDF document text
    • https://yasacompany.com/upload/files/junewikaguxu.pdfIn PDF document text
    • http://precisao.org/files/files/24947649319.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/kafen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=amateur+surgeon+4+apkPDF link annotation
    • 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_off0000d3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CF 10708 bytes
SHA-256: 19aa16320f29cf3206de90b7b60920a6570a99aa4c71a345d9298b6bb11a8abe
font_01_sfnt_off0000ec7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001048e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048E 17548 bytes
SHA-256: 532bc0bd3a653797e605464d89dfc76f1b1612dadacd8fa4f6eec6959d95af96