Malicious PDF — malware analysis report

Static analysis result for SHA-256 73783dacbccf1b8c…

MALICIOUS

PDF

86.3 KB Created: 2021-09-04 01:24:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f6861af01cb022c8fea8f4367097f335 SHA-1: 342209b56e020dce00a8e47a9e9b8e407f16a262 SHA-256: 73783dacbccf1b8c65c6bcdc4b31701ce386cf634525297218bc6f6441e58df3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous links pointing to compromised websites and disposable hosting, suggesting it's used as part of a link farm to distribute further malicious content or phish users. The embedded JavaScript likely facilitates the redirection or execution of malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • 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 http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/p1qbhjmqo5cmkr80c768iaum8m/ladidetaxulobejutunu.pdf In PDF document text
    • http://top-conversion.ru/ckfinder/userfiles/files/27267275925.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210618_070126.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/026a36e0ff15537ac5a77700dec848c4/6323625748.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ba12aed0db7---63027776607.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/kulex.pdfIn PDF document text
    • http://keacg.com/upload/files/sumitojup.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/99239341202.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/nisigaluxuzilorusibuduxo.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a391c479c53---tokozufulinigipotazaze.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f313fa157fc---mofabupidibinezalasigo.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/08f122bef4ec2cdf750ea6a7c1838aa0/94681355261.pdfIn PDF document text
    • http://rahway1968.com/clients/5/53/53e48f2724afc57738bbbcfbfdbdad27/File/tivezaxewukaniwomegif.pdfIn PDF document text
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/44635378876.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/reketadozaz.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/j68h2sqmhgoramd2tu9ajgm22j/74247497226.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec66892be8---41452117151.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/44487829829.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/95047699027.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/5kl5bgk0s10b8trg1h1v3tbflf/75155819846.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ede99c2c65c---91169544289.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/79263229311.pdfIn PDF document text
    • http://rchs1964.com/clients/5/58/580abc73d3aac4ea3a2bdd7c75327783/File/ruzewej.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/oifeug09elmap1lfnjtjh9g6nr/gavina.pdfIn PDF document text
    • http://mdtrend.hu/files/file/xubela.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc96c2b3698---kamovuwagavujavefus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=america+the+story+of+us+westward+worksheet+answer+key+pdfPDF 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_off0000e4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF6 18992 bytes
SHA-256: f121b974991f866851494464431c42ea8fdb509ee7faa39c9fdbf5bd6a189d50
font_02_sfnt_off00012ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBC 11212 bytes
SHA-256: 69fd783b59e2e5be12de207a75cf6dcc9126d0349775934539a6a89a8f5e83be