Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d3aa3efac207b9c…

MALICIOUS

PDF

75.7 KB Created: 2021-09-12 04:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1a28bcc870dc2cfd9825462df7ca972f SHA-1: d7591b802fd6589041af48be34f5eecc3d994f98 SHA-256: 0d3aa3efac207b9c0b5df937ff0947b134431cbd25be2619dc8c14db00047865
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were extracted, the structure and URL patterns are indicative of a malicious document.

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 https://gulceoyunlar.com/calisma2/files/uploads/buvajokuxidibilajovut.pdf In PDF document text
    • https://www.nbc.com.vn/ckfinder/userfiles/files/lafural.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/1880215112.pdfIn PDF document text
    • https://ikorti-iao.com/userfiles/files/19603916224.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/wakupivewoduwizubabomi.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/28028962050.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/laliziridatujebosotexoke.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e2ed9aaf8---14512463955.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/96gql5ruocobdg935ei4iiqah4/33493329983.pdfIn PDF document text
    • http://pmke.cz/pictures/files/rufobuwa.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/tibikubevotetamiji.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/62046397236.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/39057261707.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/18211291993.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/bukafamixo.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/8938505460.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/97236432845.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/87111715405.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/kagixaserajexakagebinakaw.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1470c1046---xufixivininifemeruwinakax.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021091115052373499.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/xoguwavojofazagofada.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5151d01fd---83503884756.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/41e730b2d6be6b5ab76c740ff64c6d1b/gukavupafed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=personal+cartoon+avatar+makerPDF 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_off0000c464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC464 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7B 10456 bytes
SHA-256: 7ef039e59ac4cb58e22048a3c6d9c55d0ef3e8e0ddff46781ad72fce1be3b4ac
font_02_sfnt_off0000f44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44E 17468 bytes
SHA-256: 196cbe8bfa85cd17528665c7a3bf746ee8f1cea51ee944ba9fb961cdfc6ab4c1