Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bc3448840398e68…

MALICIOUS

PDF

92.9 KB Created: 2021-07-24 06:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 9d043fc8f74fecffa27e28d2b9640119 SHA-1: 77750cf04918f5bc553b857c38514f9c02b6d513 SHA-256: 1bc3448840398e68dba782f36e25947e749dcbad254de6dcd7e58e4535c66d26
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 0.9968

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://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/63cacf7642d8a3c559bdc0968baf952a/sipawefefofitivopololusiz.pdf In PDF document text
    • http://hhcreunion.com/clients/4/43/43f38dc94a4d709fe78decf5bd9d7370/File/pojimefidivenobazanoli.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607689b09ef7f---pimunomuzuxabubuvixef.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160f8555ab1455---80414538708.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/retavewosusorujida.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/59132620101.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/91942663494.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607159abd5257---midajinirituvixixivoba.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/tejupesolozixagebusetox.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/golib.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/dusolutunabejanusa.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/62b4cd35188dba52aa3236f09c053a33/xopebugexuwoxamaxewixiw.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/lesemunar.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae829cd8434---farefa.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/vumogiwinulodefozekemuwi.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af89c6a1890---dazagoraridejuzob.pdfIn PDF document text
    • https://2acontractor.it/images/file/koborovisejewivedobula.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/98881776124.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/b8b42431110a3dad5444e9e30adc72a0/difodedisazomemufeni.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d74d42500d---63892602494.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/p4vouvhchs59op77gem72hpno0/76483447953.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73f1bc5a9e---pojirewub.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8c93858da---36717719810.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db48f858b7---vetuxegikafuwozaredazu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=what+is+robotics+in+artificial+intelligencePDF 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_off000107bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BB 10748 bytes
SHA-256: d17346eb65d2c1ae49a48528f5e15f7fd8b7096513b489a140b4b1697c1b42e0
font_01_sfnt_off00012073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12073 16840 bytes
SHA-256: 779a391e730555caccd9835301d2cc3a0fb96190b995fcc4467dd41690134c05
font_02_sfnt_off00014c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1