Malicious PDF — malware analysis report

Static analysis result for SHA-256 a053b3f0a5503988…

MALICIOUS

PDF

112.7 KB Created: 2021-06-27 12:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e51901ca8d205355cce76c9e18a51c90 SHA-1: 230c062e03251de3aa833ea061cd9d6d05c44eda SHA-256: a053b3f0a5503988056cc7a8ae57ed4537cc83f1cabdf2a7e91190faf46c43e2
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm with numerous disposable URLs, many hosted on compromised CMS platforms, suggesting an attempt to distribute malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway scanning. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9666

Heuristics 6

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://zgkimsteszew.pl/img/upload/files/zufejukat.pdf In PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4abb33818---dijakumotigowexagenen.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/c384051c769ad96d330eb3e598de78fd/laloludaxonemujulobuma.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070cebbe1514---duzotulowibexoduriwexepi.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609b85f993c01---lifeduvigofuruduvawifur.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/c531c90ee311bd7d4561fcb10f4d8035/43853400723.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cee7d48236---fudod.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/07a2e6f0vr1q6edp680h22tc6s/lixazamutef.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/kjmo6ie17crjqd4rs6j2jkjf11/63739877730.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/sofaratimubulalugefovup.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/23294654373.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a782b0625e---doxoromapajigexamirow.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/82d4c7e8aa92550524ecee3142f9a809/vujarasi.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/zekowidoz.pdfIn PDF document text
    • http://446888.top/userfiles/file/jiroj.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f7e50f021---sidivokakodikukubajalix.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d0fe8797358265b5949b87e54d817dbf/bimedakuv.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/fc760afbada6f410e04236e7bebbd74c/52305935854.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/89951821698.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/174a3f1c6945950ef2d63267790fa57b/motosafizuva.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/55395632477.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/2d90147a028353015bfc9f9349d79240/rejowimomuwabilud.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/b7d90527185972c06ce82ccca8664ae0/pogavisinasikozanijofegal.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/5cdfa71af9075bd57512275303f1ec19/datogopozorigotafup.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/7050195644caddd2f87dc65549fb1311/gojoxedut.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/pagoxapesemobugak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=password+yugioh+ps1+blue+eyes+ultimate+dragonPDF 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_off000144d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144D9 19352 bytes
SHA-256: e32487338409946083e48f4b8354b4d30f869eaf8482087ea634a564e17add40
font_01_sfnt_off000176b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176B2 11332 bytes
SHA-256: f6bd34ced7f19209404732c019afa0a7ecf71ff86f44d94d3e045bb644b9c5e8
font_02_sfnt_off000190d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190D3 3280 bytes
SHA-256: 5a742dcfaa6f795f03ca54018b6c7781d39d179268f40a18cde68d7a6da018ee
font_03_sfnt_off00019de4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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