Malicious PDF — malware analysis report

Static analysis result for SHA-256 918dd6454831e800…

MALICIOUS

PDF

84.7 KB Created: 2021-06-29 20:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 70ca1ad1d7894de1e23d3da276f6a85c SHA-1: f3446ffcd4aba15865d4951b7e6afa23a3479020 SHA-256: 918dd6454831e800256053c98c2e0a1f1edc87e7f220da151e665261e2ee13cf
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm, with multiple URIs pointing to potentially compromised WordPress sites and IP addresses. These links likely serve as lures for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://expertcomptablecourreges.fr/michel_courreges/userfiles/file/56874223977.pdf In PDF document text
    • https://atlastoursntravels.com/userfiles/file/13868924227.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/85070601356.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/gobazavonifujibavaxane.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/zerajam.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/fonagazofelujufofut.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/nelasejogowesaluvumagisig.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/ulh3k4freld8gplrl3fcjuulc3/zowagijetolerewa.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/27333086040.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ce1ab8b35---lemuvis.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b724c576c3c---jijuselurofozeru.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf3ca8aafa---zalawateviwe.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/86908e89a5606bc43ac23f343c8606dd/finewigobamokegodegawulik.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/utd4uh374sj33riqb52jl7v81p/72369294415.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/59560163715.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2ce94c995---bulabifejunasejirom.pdfPDF link annotation
    • http://albino-pitti.com/pub_img/file/jegowavemedegemaxagovakep.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/5040604201.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/8nsfc507va42ttn4g5sd3jlm96/46146561399.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16082ae477f4ee---zuzekukijamawajogudow.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/9dagi34kbb1rt7ciptvc8s53k1/wazewudamidofoluzes.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/9524bd3fd5b5726b6b540fdd62442fc6/numixuxipowugamewuwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=what+are+front+struts+on+a+carPDF 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_off0000ecdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EE 15992 bytes
SHA-256: acb1d71198e0d168d9e51d5ac3c26ad6ac772cd5b3bb873d0f313a2a1049ea36
font_02_sfnt_off00012e13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E13 10388 bytes
SHA-256: eb6475e748bb3f71383d2cc09f379a907a10d4dc13cc73be49ba7f5d39b215e6