Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e359582c7684a20…

MALICIOUS

PDF

80.2 KB Created: 2021-10-11 03:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 904f4cc87741014aff239c06b9363794 SHA-1: 68c8252b7b8c04ee888a419f53de397efada0946 SHA-256: 5e359582c7684a2084e14e24cb7d2c1b098c198ccfdc21a35674dad175bb1cd8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs and links to compromised CMS upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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 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://pixomot.ru/uplcv?utm_term=holier+than+thou+meaning PDF link annotation
    • http://ping-property.com/user_img/files/20631040424.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/74382250646.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614545a83f28e---pamajowigulumiwodud.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/86716272390.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/621c33d4227ae36a9466d9be3223c656/75092069850.pdfIn PDF document text
    • https://forumsevens.com/images/file/rixafonoxunutobumet.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/zujabukutajulaleful.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/wigamexiriw.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/fodejegojeju.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/53ea661c773a1c2c3354313c5f2b1b6f/47766102104.pdfIn PDF document text
    • http://cakenepal.com/userfiles/file/rolejekinegoxibugejibu.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/5623125507.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/goxofaj.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/51949045777.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/libijatibisotejonuva.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155814b7fdc2---kosezojupugagow.pdfIn PDF document text
    • https://almavilag.hu/files/files/34125942848.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-1/20210901072518767064.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/wipofewubaroritisexefuma.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/mozadonefetedodisedixa.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/kunikeb.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/rovebujetepebipa.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/nixuna.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/velofafasewusabekalegoz.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://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_off0000cf7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78D 19748 bytes
SHA-256: 0c0650ae09cce18b8944bea43590ebae4263e4aa0cf7ad6e551d7a26a757600b
font_02_sfnt_off00011b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B97 10476 bytes
SHA-256: d7937a56a729ee7bdf4d96f406bc87f846a893388afd131b94883c43cd207af1

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