Malicious PDF — malware analysis report

Static analysis result for SHA-256 d715f6e52c330c8d…

MALICIOUS

PDF

74.1 KB Created: 2021-09-06 03:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e6ad46ac16cfc4160cfec1043535cc69 SHA-1: 19f21e340c038cbf545a263fb3e8bc606b7d8d7a SHA-256: d715f6e52c330c8d74ce695098b9b8c2b6c5b91feaef1e1f687ec7210a31ba16
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised or disposable hosting domains, designed to redirect users to malicious content. The presence of link farms on potentially compromised CMS upload directories suggests an attempt to disguise malicious redirects as legitimate file hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mojahotels.com/ckfinder/userfiles/files/83103861330.pdf In PDF document text
    • https://europartner2.pl/uploads/vagodeletegakevutogewe.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608015501d7fa---21501194309.pdfIn PDF document text
    • http://vintageguitar.ru/ckfinder/userfiles/files/12076509644.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/o2i5jb2pnjmkbktc4qdkneapht/poluzaxuraxeru.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16126967eea152---20719772134.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/lidazog.pdfIn PDF document text
    • http://bakkervoorwinde.nl/app/webroot/files/ckeditor_files/files/vosakelavasiduxunafunu.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/lasomavaxez.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/dejaziraw.pdfIn PDF document text
    • http://abpaluso.com/upload/file/dizisowitinamigefi.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/55fd17519ca758e2f89fdf8a69849073/muxarefofenusivokefidox.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/60963404774.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd711ea489---bixitafumi.pdfIn PDF document text
    • http://carsongrad75.com/clients/3/35/35717660c32d3dd9b0ffde8f33a19d23/File/14845721862.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/61234781555.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/96161332615.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/40299748753.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/30fd197c885db8a8ca6c53ac6aa9be21/92748103925.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/dagamotolizinuduvaze.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/wolezovuvit.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d9176f829---gipeferuwolubosokov.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/l1bmvma91drnab1rhd07m5ao86/17185448623.pdfIn PDF document text
    • http://htwy.com/upload/file/40651172400.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=noun+phrase+worksheet+grade+4PDF 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_off0000bf7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF7B 10868 bytes
SHA-256: 80790b31832285c53d94da17640de54028e272d94952e5f156be95ad71aac5e3
font_01_sfnt_off0000d876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD876 16612 bytes
SHA-256: a36a9d49225c40f65cc5d11de67c47004cac372ee86f980a02eb02d501359efc
font_02_sfnt_off00010270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10270 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1