Malicious PDF — malware analysis report

Static analysis result for SHA-256 631d6e2be54492b7…

MALICIOUS

PDF

85.9 KB Created: 2021-09-21 15:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b18282cbef0bad6db3e1216ca010f406 SHA-1: b4fd73d8e58413df461ffcbf33f59feb55b8a8b0 SHA-256: 631d6e2be54492b797a314538eb3df2208c2338f370ebade00e121daa4a58eec
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://qualityroofinnandsuites.com/nbloom/fckuploads/file/72910540635.pdf In PDF document text
    • http://gtlitalia.com/userfiles/files/49830550666.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210904165435.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/fejefizufaxobab.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/soginepunemute.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/3ffbb791d401515adcb84726d2cb029e/84666674997.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210918065043_4hu7t5.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/fawekavisexasaseg.pdfIn PDF document text
    • https://gencatakan.com/upload/file/tufatoxof.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/36322853163.pdfIn PDF document text
    • http://trevorhannant.com/97916371033.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/91840596673.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/gapisabojinamo.pdfIn PDF document text
    • http://cyuansheng.com/userfiles/file/48509272455.pdfIn PDF document text
    • https://nocrime.cntwn.org/ckfinder/userfiles/files/47995870188.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/g7rv3uei4ap112ghufq6urerb8/85444244555.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137dd48ccbb3---29463843330.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/kkk2f7le4ch5u65frdjlhi6kv6/gawibegujodakoliri.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/guvulo.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/42227468096.pdfIn PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/xaxijabadulifu.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/58298936133.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/zowovabe.pdfIn PDF document text
    • http://kmjmt.com/news/upload/file/2109201731135444797juudg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=can+i+forward+text+messages+to+another+phone+automatically+androidPDF 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_off0000e53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53A 11500 bytes
SHA-256: 60ee9fa347ea4b4a1146669482f2ba570ef628633200e6b1e6905828cce37056
font_01_sfnt_off00010028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10028 19036 bytes
SHA-256: e62edd76b174d773032b5edf9a4cfbd276151e1a8efa15bcf1be8f3a40aa0644
font_02_sfnt_off00013182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13182 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1