Malicious PDF — malware analysis report

Static analysis result for SHA-256 20d5123a973e8068…

MALICIOUS

PDF

84.7 KB Created: 2021-09-15 21:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0b9d4018893c09372886c76ae540c2af SHA-1: df25cb9f45f3bbe55680a7784b086bd0c3d4b562 SHA-256: 20d5123a973e8068dc0f0cca1fe6ee97d1a00702b145c42cb248cce8572f86da
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple links, including one pointing to an algorithmically generated URL and others hosted on compromised WordPress sites and link farms. These elements suggest the document is designed to trick users into downloading a malicious payload, likely a trojan as indicated by ClamAV detection. The use of a link farm and compromised CMS uploads points to a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 8

  • 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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=spider+man+ultimate+power+game+download PDF link annotation
    • http://php-lounge.de/userfiles/file/bisobekagemupebibisoxoji.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/dulagijowun.pdfIn PDF document text
    • http://bienbao.net/uploads/files/90571739985.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/bopofemunip.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/85503695274.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/konogawiriridabuvuwedexu.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/lofozoduvomuzozibokux.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/109833b31389deda17ffa98af1568e42/mavepebajepirajeg.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/51578691855.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/keguriwila.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/0b239d9b9381a08e376974f9ec6f2435/83316504574.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/bopilatepatotomoposi.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/53588510839.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133a4b7a2420---wepobotalukowosirof.pdfIn PDF document text
    • https://internationallanguagenavigators.com/media/8731516418.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/fodegobenagusubowigow.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409c936e330---fapewegodu.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/8fifh1durudjf3jrcb47snue1q/xagogojujufovibutalawev.pdfIn PDF document text
    • http://suspensionestg.mx/userfiles/file/37542496761.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/63235354148.pdfIn PDF document text
    • https://italvaping.com/file/7701722385.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/gogewaxujijaxixoxuv.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_off0000e445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE445 18508 bytes
SHA-256: ed9de465e7b0b7c86af048e02135ef79283e74aa0e3b6b00b5d2b0048288e12b
font_01_sfnt_off00011443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11443 10828 bytes
SHA-256: ed0952a817e7793b6928c22fc07578250cc984f9c137c8465e8845ce4d3f7c5d
font_02_sfnt_off00012d0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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