Malicious PDF — malware analysis report

Static analysis result for SHA-256 27168e47d23e3347…

MALICIOUS

PDF

93.7 KB Created: 2021-06-29 14:06:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6e7efcc8d742211eeb696721fdb35ae0 SHA-1: d292ce0e6fddb69003d4ea9c9a465710667286b2 SHA-256: 27168e47d23e3347f1255e9c68acca20dffb75ffb6b8039ddf8f44b1aaebdc49
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning model. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the overall structure point towards an attempt to trick users into visiting malicious sites, likely under the guise of scholarship information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://crewmak.ru/uplcv?utm_term=fulbright+scholarship+interview+questions+and+answers+pdf PDF link annotation
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/534790cec4e8ac96464639a04f15127f/gisokabi.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/75845801723.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160830db29d0d2---61802998051.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/wupamolega.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/fn4kp16sij5d2957eej8nbclkm/11736757884.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/tisemobiti.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd5e263258---porirarasolixawu.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/2585788f0acfbb2357d0b0efafe3b87d/kibekijututego.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160be82c534daa---luviligav.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/jjf0rk26q7jhcenu824gso75or/13797088323.pdfIn PDF document text
    • http://simonide.org/userfiles/file/sugur.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c81f728dd6---98138903161.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/03b5fd7cd5a316e7386f51fa0e5f71c0/dosilazuteburepebuwovup.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/6f250398f5ac46fe77c4fcb8034ef309/85557183867.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef37a99f1e---wabegupuwonapawasitaz.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086244801fd9---51123817642.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/67401746284.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160711139f0a77---sabugijado.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608502dfa9648---kojivepazovanu.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/zidofilatajagosatetupa.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://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_off00010b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2A 18424 bytes
SHA-256: 63b2e237893c99ac261d87de3b2243ca2da16da6bd10fe3849f53be0d686653f
font_01_sfnt_off00013b0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B0A 11412 bytes
SHA-256: a2eeaffbc1388df7a8ca548d8ccc4c91334d031d30801c073faf5ac1f6f9da1e
font_02_sfnt_off00015538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15538 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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