Malicious PDF — malware analysis report

Static analysis result for SHA-256 d70d705032b5b598…

MALICIOUS

PDF

88.6 KB Created: 2021-08-09 04:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 2aae21f8bef05176b49fd324da09fe3d SHA-1: 3e401e3fb57b83e23d7ea9d0a20904cfeeb2b434 SHA-256: d70d705032b5b5981ee54ae4cfb79b7633118191cfcd38e57d948735a96a0aeb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous other PDF files, many hosted on compromised WordPress sites. This structure is indicative of a phishing or malware distribution campaign, likely initiated via spearphishing. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://clingac.com/d/files/lexazasugajuvelulaje.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a18bbbdd998---mifelopoxapi.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/tj07ta3dkvcq4k3on0ht39sj0l/45062740854.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/midukexotojodujetep.pdfIn PDF document text
    • http://whitefamilyreunion2020.org/clients/4/4c/4c64578d40ee165aaf486c9a1ef3309b/File/banomudaz.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/47fca571552f70345d80e0cf9812ea1b/47832355386.pdfIn PDF document text
    • http://www.bash.cl/media/file/losefujadaravukoru.pdfIn PDF document text
    • https://renetravel.ro/images/files/zigitibexavumaridofem.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/0oupe1cmam6q93dtj7tbfcf506/35873282553.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/dr7bf5sd1gq7ij7rbn5ahrc5h1/gonel.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609b263caf991---12213532677.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/214cb05e914d1ae1ab94e655cc236051/41790169780.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16076821fd1dd6---9384945361.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926752a5faa---negiluwigapunejiwerasa.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/8034457303.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/mezikekefakuvuzulored.pdfIn PDF document text
    • http://szpitalstrzelin.pl/userfiles/files/82626477289.pdfIn PDF document text
    • https://fivetc.net/uploads/files/razuxiwivaririfarilaziz.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/93040493713.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/57116942071.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f7d978b1a---bigatetuwujowere.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/vapulozuruzet.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/449a3488e4a2aa9369df492f17c09bdd/jogizaxuwaroligodufibig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=ielts+listening+sample+answer+sheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF651 16948 bytes
SHA-256: d136fac6e2de4765128628421cec9ca364291a0595f3825dc63967277a8beb9e
font_01_sfnt_off00012229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12229 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A40 10928 bytes
SHA-256: 3ac7b4701a346374f237d2dde3cb540cc7c7243bc3cbad613a23b00348203e65