Malicious PDF — malware analysis report

Static analysis result for SHA-256 1059bd3b82fdd3a3…

MALICIOUS

PDF

84.6 KB Created: 2021-08-21 01:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 542c67c5cb19d14122015412ea8b9692 SHA-1: 8eff651f59e4b1f4d6a1f9d8e6c45946e15459f2 SHA-256: 1059bd3b82fdd3a366aee2888ac060e5164d561bd192dcd58d4d3c07f106ddee
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of urgency and payment lures further supports a phishing or scamming objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://latexindia.com/userfiles/file/61295019088.pdf In PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/2be724106cc5e9382e18f2ed831d739a/58742625978.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffc4fe0b53---gidemanejivotaluj.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/38eb7d48ef46ec06f61f6adfe1d09e59/93470872411.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/najas.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210710195229.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e92a9b9df6d---pakurakekafekot.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/mowezewotejewif.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926acbc33b4---51326069592.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210715103124.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/qobgm98feg0prcuvd50bu3gkd7/biliresoletemakobugodofa.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f544425ae---23504693621.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/85881139198.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e213d8318---3497499646.pdfIn PDF document text
    • http://ballstonfamilymedicine.com/clients/861402/File/bipomonemexefu.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/7341dc2d6f42fa743cb4658ae1144e2e.pdfIn PDF document text
    • http://baybayankaauamo.com/clients/c/c9/c9e0f772d4a556598cfa564a27137582/File/79719628301.pdfIn PDF document text
    • https://warungmimpishio.com/contents//files/mabupisujazetonilisim.pdfIn PDF document text
    • https://ultralloy.net/upload/files/bibexoligofokaruxugen.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/51941558827.pdfIn PDF document text
    • http://logopeda-empatia.pl/content/file/28442746964.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/nexefotejexo.pdfIn PDF document text
    • http://indemo.pl/Image/files/44473802844.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/mmko52l2klg21j6go71gb9h7vq/kejixividejor.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/47830843377.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/a6692ea1bc4c7cd518385d20a183fa99/datefenit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=project+completion+handover+letter+samplePDF 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_off0000e6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE9 10976 bytes
SHA-256: 0dc2efed6b63a812f9604bcf0c36c35f7950c297de1c5940dd7835f62f08b520
font_02_sfnt_off00011824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11824 16644 bytes
SHA-256: 9092a7b79961a61ce18d594980fb9d59481a984f6f86db07fc9761d49a8d1894