Malicious PDF — malware analysis report

Static analysis result for SHA-256 38b31c5c7dd1886d…

MALICIOUS

PDF

83.8 KB Created: 2021-09-15 06:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f2345faf7e53ff4316b8d2dd479d6388 SHA-1: 7dc3e39cdc05cf2c7011daad9bbf171e63c9baea SHA-256: 38b31c5c7dd1886dafbcec68226852735f6fcbebfa470b7eea2eb4eede820882
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, several of which are hosted on compromised WordPress sites or disposable domains. The primary goal appears to be to lure users to malicious content or phishing sites through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://quranday.org/userfiles/file/kitumololazadumafasefape.pdf In PDF document text
    • http://mikailang.net/userfiles/file/20210904093453_1498240548.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ab7633050---melumugila.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/kivanezakepifezet.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/4998570515.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/wotirifix.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/bixupatimufawolatemem.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/wikatibosoj.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/pixizuje.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/9b969b055c7d8def1260093eecd43552/numunekofulixeriduzedi.pdfIn PDF document text
    • https://hoongnau.com/upload/files/25622519030.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/36777639750.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/kelazap.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/89d18f950bd08e6e5560330a30fbd4c8/bonorumokuwofatolefax.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/lumulupegozinifiw.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/8494116ebcdc5c0708062510cbf9104a/kavutoz.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/1209077197.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53931011512.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/22618612244.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/viwejagax.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/pulur.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161408eb3cc032---17051067745.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/dofepigemotevus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=android+delete+all+photosPDF 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_off0000e2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F5 10468 bytes
SHA-256: 16bcdad0bd89d67fe8038e14b7a3e6f4657804eb9965f9bf4f121cb16cfdbe36
font_01_sfnt_off0000faa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA4 18332 bytes
SHA-256: 92c35b1e011b0299d75cda6cc94329c522a2c473a73d8207588fc89f7986c5d0
font_02_sfnt_off000129a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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