Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1dff7bac718eb8e…

MALICIOUS

PDF

88.8 KB Created: 2021-07-16 04:10:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: c84d63c89c78339ddd268536512f47fd SHA-1: 098b40246bef3be98c4f363fa18c52ee3ceee6c1 SHA-256: a1dff7bac718eb8eb9c1a41caf7a5b7fb585037fdaebc7749a365c62c743783a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/isnqb1i2l447bmnqkhtgqub5f5/22691532688.pdf In PDF document text
    • http://brickform.cz/obrazky/files/gijan.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/72751235461.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/sajaseposeve.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075dc2453d30---35923179315.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609db7118d0ab---sesuwuwisavujawuzifele.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608244576bffe---desokadosezajubuwiza.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/zewejolisiborowabowafamo.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ac5bc7b9f---xulotugesuzufelusabex.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16070362b7d657---milura.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/84bcqr9iebgd8d9jctf63trjqs/96858485267.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/rudusagelul.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d86a00641---46860811661.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160839d3deb21b---wodabovopagemakevepebilu.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/7dcd9ed7bcf01c49ccebbf8fb11c0382/rafuketusike.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/58856081558.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/5b063d41671c348bf2798865a2731eca/mijobomatisine.pdfIn PDF document text
    • http://suttonoakfarms.com/clients/880813/File/57954133538.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/232a89651ad049613993f61fa5e23158/bopokemukutava.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/bimikifogulozekezutidiw.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/4468335437.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/70946798366.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/28393573651.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/04e904db31135617b30b97d32359955d/97117941771.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=it%27s+about+thyme+nurseryPDF 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_off0000f7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C7 17592 bytes
SHA-256: 6c6f1cbbc4ed5c2e4465709b9d11c71a3632f5c87702a79d0955e08cb764cbad
font_01_sfnt_off000125cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125CB 10576 bytes
SHA-256: c34c8886053a04bc9c68e299378cadf08ab530dd5a7c5b2e63d4ae1fb9fa055a
font_02_sfnt_off00013ddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1