Malicious PDF — malware analysis report

Static analysis result for SHA-256 01729b153cda76cd…

MALICIOUS

PDF

104.5 KB Created: 2021-09-05 19:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fbfd4f70f8fc1380966b164fcf849fdd SHA-1: bf659bd786a71afb9e160794d8882d2e254c3932 SHA-256: 01729b153cda76cdefa0a75fc00ba4fb483b5092811d732b4b93d5611560975c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting it's used to host or redirect to malicious content. The embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e737c07696---zoroxirarukegife.pdf In PDF document text
    • https://deltagroup.bg/uploads/file/31643659547.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/vitufejidewesesonujif.pdfIn PDF document text
    • http://twothirdsmajority.us/clients/38522/File/45514863574.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070a0e2cfa29---89708371008.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/54923855272.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/nimupidomerezalajunel.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/fijudibav.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/49416939528.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/kelus.pdfIn PDF document text
    • https://oklasik.com/ckfinder/userfiles/files/sojefipakivemexopawiba.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/56193452410.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/vibubaforinin.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/fa5a2cf366d001844dcd9ad9e052737c/mebelewabogugitanapaf.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/wolifebekowudaru.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/lesaxo.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/ffb86975364c48fd842794b6375af832/pulasujades.pdfIn PDF document text
    • http://skazka76.ru/pic/userfile/denejijaxu.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/28789211428.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/10401513785.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/liwikifoka.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a96b9608a1---52377425775.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=gunnm+battle+angel+alita+manga+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00017705.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x17705 18040 bytes
SHA-256: 050b393ac28829a42cecb83d713991868f1f054f41f091320146d0bd1f17560d
font_00_sfnt_off00010abd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABD 10732 bytes
SHA-256: a1603dcad07dd3096e61d97fc3d5b54dbf3c7e194ff973c3c1092d56f17e9ef2
font_01_sfnt_off000122f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B03 23012 bytes
SHA-256: 38257c444decd64f371830cd6a1e358d19c240a97c9da4280630ac49db2af6c5

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