Malicious PDF — malware analysis report

Static analysis result for SHA-256 253b94ddc8b15cdf…

MALICIOUS

PDF

84.9 KB Created: 2021-08-05 07:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e9ea67f559de5c6db6638e81f6054b1e SHA-1: da81e22112e2415a3e58376c183eda857bb6af6b SHA-256: 253b94ddc8b15cdfc9ec63576cbb6c8abd43bfe662bdcb77c63f28e9c27a6b1d
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains a large number of embedded URLs, many of which point to external PDFs hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The presence of multiple PDF link farm heuristics and the detection of Pdf.Phishing.Trojan suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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 http://www.tekkoo.net/images/library/File/sukuri.pdf In PDF document text
    • http://re-view.online/fckFiles/file/77860693325.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/qji559tnblvmehg1f2fc652gep/51514943428.pdfIn PDF document text
    • http://peak-experience-japan.com/78032719246.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160718db817b9c---53663739545.pdfIn PDF document text
    • http://elise.pe/images/file/38970876896.pdfIn PDF document text
    • http://billsky.ee/files/file/kowuwiwi.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/dp7ajoqhdoqvspgf72phhao997/59976255858.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/c4dbd3a4ffa37fb85329951962980504/85120303003.pdfIn PDF document text
    • http://glcore.net/ckfinder/userfiles/files/97550455397.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/rovotoniviwiwolasos.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/93447743370.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f70e4e1b93---mamoluzonatomotaxulif.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/30182291302.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/2861c346a0c65e8846ee50a6bc9bb6f7/95346724589.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/31434664006.pdfIn PDF document text
    • https://izr.fr/files/xufifakad.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/f8535c50a89a9a829c6d52a1d8fe9fdb/faxixuwinilexaku.pdfIn PDF document text
    • http://billsky.ee/files/file/tujesasoluradatope.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/88403945883.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/bibax.pdfIn PDF document text
    • http://kirche-treuen.de/UserFiles/File/77512096315.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/36708383457.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/12a06e97c2e55748061d8eddc696283d/68375887146.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/81986414241.pdfIn PDF document text
    • http://bud-drog.pl/userfiles/file/92824064577.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=adding+and+subtracting+fractions+with+like+denominators+worksheetsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FD 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_02_sfnt_off0000fe43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE43 11324 bytes
SHA-256: d9d3cb447652515c50ad3f1dde899192546b9bdc667e14aa1e1d1434519b93af
font_03_sfnt_off00011895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11895 16860 bytes
SHA-256: 4182a316aede66dd80a3e5a8313e177de34fee0dd941dac5e96fcfe2c6445bc6

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