Malicious PDF — malware analysis report

Static analysis result for SHA-256 915991f262da405c…

MALICIOUS

PDF

83.8 KB Created: 2021-08-19 12:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0f5c00eaa5971c3825e47887e9bd61b1 SHA-1: cf9c540d5fe44e2c0f14c8286845c23ceb03de7b SHA-256: 915991f262da405ce0eb6a04951592379923c530aedb137fc96731cb41638586
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links, with several pointing to compromised WordPress sites hosting PDF files. This suggests a link farm intended to obscure the true destination or host malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160945045c2b49---tuxubilabog.pdf In PDF document text
    • https://nanyangtextile.com/userfiles/file/zalusum.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160ab66dde3f0c---73186460523.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/nademalerovexawajimitub.pdfIn PDF document text
    • http://etre-belle.su/images/file/zoxigoxebakexeviwotawa.pdfIn PDF document text
    • https://fasaac.org/temp//files/rugegidivevikanewifuxedej.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/97dde9bf75e23b1e325275e4a16b16bb/kulaz.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/63923445226.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/medeligoxuzedudu.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/obj5df294mjg6b3c5dmc3i2i9b/39710767494.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/65672e3aa8aee47fa64d5dad09e0b2c7/dutipakavameravog.pdfIn PDF document text
    • https://citrasas.com/ckfinder/userfiles/files/58844958279.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986b564d32c---pelavawevi.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/66052487730.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16077ac39debe5---76864735667.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/kln7rf5hnllk7imj2homun7i5h/57928260403.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/4ju8shhett3ffbej974e6ishq1/93417590302.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/dejewawuvu.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/77bdbe81556a42ce00fe6da4f81c562a/10675912746.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160a84d6eb4db7---10025317691.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/26012377082.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/78658482073.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/73777301569.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/f9f2d0d705dbf84426d2ef1c8cdad2c5/zuvufogavumavawi.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/r3jjuk3fe6b7ricfgonj9eclq4/kozumebutagolefavivewi.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/19758845162.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=restatement+second+of+contracts+sec+347PDF 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_off0000e1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D0 10844 bytes
SHA-256: 1e40fa920e2c77758aef41092bba5f6c4caaf62011f696ec9393443861a3098b
font_01_sfnt_off0000fafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFB 17456 bytes
SHA-256: e699525ade507ca034ece435a4ffcfcef894e7a36b926417e322b6109a418fcc
font_02_sfnt_off000128e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1