Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c0470b74e6744d0…

MALICIOUS

PDF

80.2 KB Created: 2021-08-23 09:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 062bbc6e711ff03f14ef8264b08fac83 SHA-1: 75d8af2e0ee323ee169928f8a07ca1d67f459c27 SHA-256: 4c0470b74e6744d0c9e56f34fb0c9819281d2a3003bd26cb10823a2e2f34f347
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS uploads or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://elementsgogreen.com/userfiles/file/49886379061.pdf In PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/ropirukolupogafiw.pdfIn PDF document text
    • http://fairmonteast1969.com/clients/876766/File/rubetogipe.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1a3a755bdeb977bd86444ad13201c4e4/pabazitaduvefojukuzi.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/wegijipar.pdfIn PDF document text
    • http://katachizu.com/img/news/files/nixuluwinosebuba.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/2tir4vaqs60oac48mra05ofbbf/zowogagipos.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/busakowinimiwajumematesek.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/98446404058.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/jewugov.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-7-17/20210717144206746764.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b81c11865fe---sodoruvupuxifakigi.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/68342783648.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/99191015054.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/evrqc6pstg8ucc8gkcodkbir94/saviwi.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/82232235a7d0123bd771e87f237b2c1f/15527697123.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080d24393c5a---84851210461.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7707e92bc---4213272347.pdfIn PDF document text
    • http://dmscsmartlifeblog.com/userfiles/files/xosomifubasatune.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/kivujitazijivejubujirer.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/1395164278.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/julogemoxakavewopa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+find+fixed+cost+on+a+graphPDF 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_off0000d751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD751 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF63 16316 bytes
SHA-256: 4ef1e0887a3b2c697445b64ff144d9699a811f98c08b2db30929ef65a2095b52
font_02_sfnt_off000119da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DA 11032 bytes
SHA-256: 7260a5b8708fe00bd93686717ef19677eea39930e192644c5a36048a7763b16b

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