Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b66d459e6bd8a8d…

MALICIOUS

PDF

73.2 KB Created: 2021-09-05 01:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 050efe04cf416be74fb9123f26bd3135 SHA-1: 64cf06d5bbc69e80c2278702da2db711144148cc SHA-256: 1b66d459e6bd8a8dca35fe686e974aeaa3d8678898321b347580b33ffa6ba39c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple link farms and compromised CMS uploads reinforces the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://salamatekhanevadeh.ir/ckeditor/files/files/dixivarorixejakupulaxusa.pdf In PDF document text
    • https://aradmissions.com/ci/userfiles/files/82619277011.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-8-6/20210806040622118997.pdfIn PDF document text
    • https://defaico.com/d/files/77779422342.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/ralimobenu.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7bbeacef2---ganulujaj.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/tajegetamimunakozo.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/65504883221.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/kamoki.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/h1ekgkgsand653jl6acbp6lnt5/wuvubuki.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/644q723h04icnsvl269tm2r987/30581360177.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec2ea87233---47523156606.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/jujifamarumulijijojilor.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/97932982010.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/nisuxarewimilif.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/ad71a8444b4d636ab1313ac1623ae901/53104338683.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/pirerunevijubizabozesoguz.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928ed9134bd---kafuwukuvipal.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/40150091098.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/26807135561.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/debop.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a9a7720fb---mekazurilege.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/xixexudokifufo.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/85034346353.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=successive+approximation+register+adc+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_off0000b9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F5 11260 bytes
SHA-256: 75bf410ce133ea5a43a876f2ca79cceef26039453953ff8d6b13f3ac3f704921
font_01_sfnt_off0000d431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD431 16676 bytes
SHA-256: deb68d5eabce61f8b0d471cc8c8fd239186fdc49fe9138463f83b40de6d8f031
font_02_sfnt_off0000ff1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1