Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b34a28598a9eb32…

MALICIOUS

PDF

73.9 KB Created: 2021-09-10 20:33:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e4768d2fff663e17e30801cf912e5a96 SHA-1: 8bfc898b2f1d5b8057736013c2a26ad969ec1ded SHA-256: 9b34a28598a9eb322d6c6b8ba5133c1f02dd78c26a84e52c8db65c2d17cfe9e6
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised websites or disposable hosting, indicating a likely attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, consistent with phishing or malware distribution via a spearphishing attachment.

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 http://farmandari-sarvestan.ir/images/news/files/63409714225.pdf In PDF document text
    • https://computerzone.pk/file/polijawunosixazilepe.pdfIn PDF document text
    • http://deauville.ru/files/file/87814565153.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/f8190369754bb11a34e3843bcede40f5/ziwozimilexaw.pdfIn PDF document text
    • https://juraganmonyet.com/contents/files/kanomekojujeselu.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350626cd3ea---wopan.pdfIn PDF document text
    • http://pentas.eu/userfiles/file/supifek.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/wuboxekuridujimagulizug.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/60243604444.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/fejijujonogomake.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/79201114174.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210903205403.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/425849498bbcf86f0f05c27dbbde9117/53296059188.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/zijudode.pdfIn PDF document text
    • https://signika.pl/Upload/file/viwukovawijonetokixubad.pdfIn PDF document text
    • https://aromamarketing.md/img/files/sajajepofowupegikabo.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2d36d8b58---75392979715.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/piponofofavidogix.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/tidoboma.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/kezutesoxuxuleweruj.pdfIn PDF document text
    • http://thewesternmist.com/userfiles/file/nijadigumisamoj.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/artcano0jrvik33ai63gdmdfnq/tateroxedusudujanetew.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/46f68d5be999b0ccddae45b4e8308d35/tifomutuduvigi.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/sinonipopelotexorejubi.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/43544494333.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=websites+to+watch+movies+without+signing+upPDF 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_off0000bc8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49F 17044 bytes
SHA-256: 7a6508fc544ac9532bcc8bd1a06318f47defe7d5c51f735731ca0e916db5ba5b
font_02_sfnt_off0001006e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006E 11060 bytes
SHA-256: 8b0b1d60111572bbe77751aa65c5d6fcc209fcff774c149afba779b964fa6daf