Malicious PDF — malware analysis report

Static analysis result for SHA-256 835081894cfcb2e7…

MALICIOUS

PDF

86.5 KB Created: 2021-07-19 13:04:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4ff044855c47748bc4d5ee015bad3cc4 SHA-1: 33e2c6e0dbe34414c7c66272a4bde2828bddf2fa SHA-256: 835081894cfcb2e727824172d1982623d8f6a2b95f75e69356e0bb39d1a45c2d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is intended to lead users to harmful content. No scripts were extracted, but the sheer volume and nature of the URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 5

  • 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://eminencesolutions.in/resources/userfiles/file/ruxinevaxexabajomenodot.pdf In PDF document text
    • https://soft-print.pl/app/webroot/media/files/toladenegiziru.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/vikatawalegubavupi.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/demazemuxavadozuniro.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/f3e348434c47f035ced99fd2e17a9f56/97515781974.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/eee3496b2e936010a39fdfdce764d521/ginogisumajev.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/potilevifaxejox.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/lofow.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/62912315404.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/680no8hmmssfj8msrd2eas0517/nametotunava.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/jusoxetolep.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7551c44fe3---87817476168.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/wuwewisiburenuzu.pdfIn PDF document text
    • https://aitalk.vn/upload/files/futiteruzotevijijizuxewos.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/54244666606.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/adb03e0dca508813e0f51093fd11b8ad/mebabalejipu.pdfIn PDF document text
    • http://ipllaser.in/uploads/bekijixaxalosevorunupov.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb96ab8ac9---bujerotemajitono.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/rerozaxuxalivo.pdfIn PDF document text
    • http://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/kepemuviwaget.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/wazujobebodogorutebiboren.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608f49cfd7c77---65235823231.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/92d729e48075348aeb5e7f1648dc9718/lisediwadaloguge.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c719a199db8---vupipobul.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/c2b337fd1eb514c11cda881683748b30/kexojuvekoxotekagug.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/ff1e43ec00b0c55d357d55131dc361cd/moterikeguwuvasu.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a80f3335d79e99548d7998e8c47c602b/91989448814.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=star+response+interviewPDF 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_off0000f047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF047 17156 bytes
SHA-256: ee2aabe9313cd4420ba2978f62f0203f7db94b03dcbcfc377cacbb77da641d6e
font_01_sfnt_off00011cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC0 10428 bytes
SHA-256: 98002fbc22076e9f0019a0d632634b9fff59016795cb0c17e10140006cf9936e
font_02_sfnt_off00013486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13486 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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