Malicious PDF — malware analysis report

Static analysis result for SHA-256 e825ad1fdefe659d…

MALICIOUS

PDF

82.1 KB Created: 2021-09-05 15:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3e383a911d2af3abcb3020f5b31a9568 SHA-1: 426fd695252cfcb58c241779f40aeb1cfc6d710b SHA-256: e825ad1fdefe659db7438b7bb0fec07747ceabca152d6508c45a584ff82b6465
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting domains. The primary purpose appears to be directing users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/20648916907.pdf In PDF document text
    • https://dragulf.no/files/file/kunapedefipolokujitow.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/e190c1b067eec9b064811e1fb6ec3028/66682857833.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/79669934918.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/sl7jq094vpl5j1ma3ek0q87k8q/vujonikuzak.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/sugefovizuxokasibix.pdfIn PDF document text
    • http://nanopena.cz/upload/file/kagunirajavimexipituk.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/4ouuq5vup7770l1m7jkkb53a3r/42522376226.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822ed2607da---7376630707.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084659cc4b10---posakerurixul.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/a2f5ci32fb4e8rs6mc9dq2bm3a/71982500064.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/4901422310.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/fademalalajig.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6d405e3e82---69747210372.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adee856d541---fuwogalasilaxo.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/161150f30d8f34---tosisuxuvumesepe.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/vemuxutawuk.pdfIn PDF document text
    • http://01host.ru/userfiles/files/78042283607.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/kuluwigusoziwanizetuwop.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/vrfmthks7lmu3v3g22puq9rmc3/pisasadodi.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e922ec4631b---38309704981.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/b7e71125f897e49527756f0f2f49faa2/4220863090.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=efficient+electrical+systems+design+handbook+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_off0000da5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5B 17496 bytes
SHA-256: 8066372773108571fb8a07db1e0e2a5e4fffb7de06e95680fbc636c6d2b982da
font_01_sfnt_off000107d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D0 11396 bytes
SHA-256: 61616ece26b7c56658c32ffe2dbd069bb3a0d6a81c1ad26d256a3aa5c5d26e87
font_02_sfnt_off00012210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12210 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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