Malicious PDF — malware analysis report

Static analysis result for SHA-256 161f0bab8dd32e8a…

MALICIOUS

PDF

94.5 KB Created: 2021-08-08 17:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: f78fe8d9d3b6e1b1dba5e5e90e871499 SHA-1: 4174b75d41a2d5aded1a176d37cecb3fa9dbb96c SHA-256: 161f0bab8dd32e8ab7e9dea7d8e66090b6b481426ea823d4900d5a2280077eac
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 0.9977

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://someteme.com/archivos/_20210621060117.pdf In PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/2930b4ce77r47dgnq4on2ffadg/23800717501.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/a1fc611df84cb6021f13907a5c653b78/kusugolu.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e332a517b51---kuwokomuzuvi.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/xigexufadupotupewopi.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/ramuxuxizepevejoniduvov.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/70137831546.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/31296642244.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608219f0c30ad---96342064819.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/0d1620eb0ea5a84fe556d5ead5d5ce6f/34563252787.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/31642966712.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e8cf6db670d---88396346631.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/8525956380.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/fozotap.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/89298427135.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nadarukol.pdfIn PDF document text
    • http://msamericapageant.com/clients/873634/File/65111973464.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/ruwuxewanilijija.pdfIn PDF document text
    • http://konberdbio.com/upload/files/pusemi.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/nivizazarod.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0974c84856---81226517473.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160fd036452c47---55312661943.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/58825962581.pdfIn PDF document text
    • https://samowar.ch/upload/file/voseraradodopugilas.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/rumidadetu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=t%C3%A9l%C3%A9charger+incendies+wajdi+mouawad+pdf+gratuitPDF 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_off00010314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10314 11500 bytes
SHA-256: 9d29f18aa31e4b0c716d4c087ad94ad7008ddbd9c35f17116fc89c0e2f18e226
font_01_sfnt_off00011da5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA5 20044 bytes
SHA-256: 30727685419a591c4e9cd33eeea1b03870a3417043c2265c2ad5f08ba1c5cf25
font_02_sfnt_off00015034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15034 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1