Malicious PDF — malware analysis report

Static analysis result for SHA-256 da285a7e19acbe37…

MALICIOUS

PDF

89.9 KB Created: 2021-07-23 07:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0ec5c6af02866c8eb685b1bbc9cf92f5 SHA-1: 66519e47d275d3e364dca4ba4ea98ed44a0e49a3 SHA-256: da285a7e19acbe37627176a639b12eccca3288619ea56655ed9803223cc2b0da
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous compromised WordPress upload directories, suggesting an attempt to lure users to malicious content or phishing pages. The presence of these links indicates a likely spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/74c1808f8ad8751f4176bb28aff13246/29411206663.pdf In PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/8311520068e17ceb8421dc0e8e2ad67a/nukegirosimeputul.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/eae60679abdddbca9438658335f0e5f9/80893553668.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/de1c04d3be6eb8ecf931ba804ec5edbd/worixodiv.pdfIn PDF document text
    • http://upbfassadenbau.com/upload/file/48383644018.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898e1b596a0---garetinodojawalolotaxu.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/g11ppvfsne7kvmu6enn8ijkbe7/batetupipaxigot.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210706160756.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/siuugocumddne5jhpfujchf7bi/xobutuwuponokalibomefiba.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/rinejazeve.pdfIn PDF document text
    • http://alwaysfavorentertainment.com/clients/879371/File/gusotota.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/6705577463.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/pefikisije.pdfIn PDF document text
    • https://cecprint.com/images/file/20586244250.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/mijego.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/jusosibiwe.pdfIn PDF document text
    • https://petala.gr/userfiles/file/23903184797.pdfIn PDF document text
    • http://northwestpixie-bobs.com/clients/e/e1/e1941a3904c49320334fd90e0ed9e852/File/mixanomaj.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a13e2082e70---69405117887.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966939094b1---wiwizutipulixasagifibadin.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/6eb7ac992c7eab80a1526bf941cd53e2/katakatojenutigovefub.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/egmge1umffuu4tc564gssl2j7j/wupuroxes.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/08c76a1cbd48138f224c4c05a22eb82d/wujajawemab.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ccad5a4d1---30701645168.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/zizanebuzababigibef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=asparagus+and+brussel+sproutsPDF 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_off0000fb48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB48 10696 bytes
SHA-256: 338565162c257585168da7008a61857299a0814e7ca5a5d26c9b6db382450e0b
font_01_sfnt_off0001138c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9E 17512 bytes
SHA-256: 289e14525021598611b8bbd4fc61ae5eb6616927702f60553657a97d94008c9d