Malicious PDF — malware analysis report

Static analysis result for SHA-256 37289705cd6f7b67…

MALICIOUS

PDF

81.9 KB Created: 2021-09-02 21:20:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0f01d76fe1a30a47911b95883782c957 SHA-1: 04ca622f7fc548e5efedfeee7759663458235eef SHA-256: 37289705cd6f7b673e995ff61efa2d8b0e383c0388841f4ccdd8fc2723a29f67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, many of which point to compromised WordPress uploads or disposable domains. This behavior is characteristic of a link farm used to distribute phishing content or malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=chaffoteaux+et+maury+mx2+24+ff+manual PDF link annotation
    • https://cortopolis.ar/userfiles/file/zowifabigerelojawaferake.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16074286b65887---58539829687.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/38797239199.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/68878188405.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/0u11mf5o3hdp63n0e1o4mqk10o/91052237999.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//lomojekevukepufatu.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f621ac55e5b---tabuverivojol.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ade7a9677---89759608381.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/86546435986.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/64n8nh8cqpohmk3teet1ravkd3/90043523087.pdfIn PDF document text
    • http://sb-78.ru/files/file/jetiwimebekowuf.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c95035985---75988071113.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-7-15/20210715230226236508.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/56772989669.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/50375226129.pdfIn PDF document text
    • http://grimastone.ru/files/baxuvimukoxufufox.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16082b450476ec---28404462189.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0609/eb035d7880179d8d6d58a75df50c6df7.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/b831443722946a57ad9dd6959e4c6522/sapolipabewe.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/50794869067.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608729a9ef6e4---xefuv.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce50b2d012---nosonemub.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/detexigudojuluxobusola.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/zasasul.pdfIn PDF document text
    • 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_off0000d65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65B 18432 bytes
SHA-256: 71be7362b365def7821d979b4fe02be5005894fd7707d293d5b1f4394f9591e7
font_01_sfnt_off00010738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10738 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4F 10764 bytes
SHA-256: 4a370d2758591fcfda2d3be25ab679690ba6a82040cc12a1074aee5b7f377f56