Malicious PDF — malware analysis report

Static analysis result for SHA-256 8da1058cb0a2d1b2…

MALICIOUS

PDF

87.3 KB Created: 2021-08-14 04:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 08b1c7bdf72e0984cb6dae97c16165a6 SHA-1: c302140bfffda5d102a46be315bbb0c47a256c3f SHA-256: 8da1058cb0a2d1b281e6b380f2faf4a042b23eddd99059d9f98e4b029d4155b3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. The document also features a link farm with numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to malicious content or phishing pages. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=cadillacs+and+dinosaurs+mod+apk+revdl PDF link annotation
    • http://www.gdchgs.com/admin/img/files/fetusazopolajas.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780f3110463---59938906715.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/rilugisabirogemevosiwotew.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddf4a910c2---mawipurifozex.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/nopizijofuwagur.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/cc9e00af49c901cd3814feb022b4ec30/letudi.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/betedikemexegiva.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cb7c51136---vadepafufibonoketekus.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/kubufiradabeluduvuporeta.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/9ce79ce091022ceb09e48890f6ff039a/94015056659.pdfIn PDF document text
    • https://immobilgold.com/file/6259777635.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/irosc1vtfbcnmpt9r4gabne51g/22476144467.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/8f758fae4d908875ac78cbaec0438d4f/jexafolomaranaki.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/viwubugalinopeduvoneser.pdfIn PDF document text
    • http://altinay-law.com/images/file/7114578044.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3935d93a9a---jowadiremi.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611291f74a143---27269323577.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/kekuwuwovixigobi.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/74468421435.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/a0796443b2e6bc21b3e48bfdfe948252/selikizexuzolujekupax.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/23257970871.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/5337808555.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/31513da4f866166d9126a39df88fdb0d/likemixolopozujir.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160710c11ba96b---57721417474.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/kiwugoxelojupud.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cc55197011b---nomowokusupajetatemuti.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_off0000ee4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4E 17392 bytes
SHA-256: 6493beb3d98c2d3c1181b248ab7977dbd5354e7080351190d110459b0904a6d7
font_01_sfnt_off00011c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C03 10868 bytes
SHA-256: 519eb0bdacef4e361559f067e7a5ab437d3247fa4d5e8bd5aa68da7e29036603
font_02_sfnt_off00013514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13514 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1