Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab905b57c70a2106…

MALICIOUS

PDF

76.2 KB Created: 2021-07-25 03:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: a3eeeb1b7ab4f7dabc2bca79b9e7314f SHA-1: 9cb5a83b6e18be9a1b2c192e26ad965487416906 SHA-256: ab905b57c70a21062197c1126c131cfc3c525f913f858d19b2bbeb9acaf7a588
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609735198832a---soxejowosuzogu.pdf In PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/hn45ngo0amh409aq2t1p3859us/gikolu.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088db4c40a21---34467280767.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/jogexuw.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c1f6a2f0d---verewa.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/tukojalowegegakigamez.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/soredofo.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/96475784217.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/07/01/57148129968.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///wuzumepefi.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/57692960898.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/54090235364.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a25b46ba3be---11477066795.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/a0ceb18b0f9551f13e3f9f1598ba4293/fijifiwotifezuvam.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/sosapuronofobukafubove.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/berurazo.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/buweligidagitejab.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741efc5462f---97107098722.pdfIn PDF document text
    • http://fenotropil.ru/userfiles/file/zonin.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/61887290359.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d9fb8dc11---repag.pdfIn PDF document text
    • https://anfauglir.com/images/file/wemowopiwikosefu.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/kp332ecqpvkpe084d93uquf7v6/vokixixidewelepov.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/32000640874.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=hazard+identification+and+risk+assessment+slidesharePDF 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_off0000c83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC83E 10884 bytes
SHA-256: 1655165b3b7c20a2dbce1cf33be4c984d62099d22ace253213fc908407e937ec
font_01_sfnt_off0000e12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12A 16248 bytes
SHA-256: f9cd38e11b7d982e4abafdb0798e4beda8f658902174bcfb6c41a27ed7a2d2ae
font_02_sfnt_off00010b1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1