Malicious PDF — malware analysis report

Static analysis result for SHA-256 aae883918cc75147…

MALICIOUS

PDF

81.2 KB Created: 2021-09-23 15:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a007425d9213f7d5629053bb7a38d400 SHA-1: 7c0803d476adbb321de460e9648aecdeb9425ac3 SHA-256: aae883918cc75147eac0c75fbe2947435869d546af2cf0784e91999c62077d52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, likely attempting to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://allytemp.ru/uplcv?utm_term=minecraft+bedrock+edition+free+mobile PDF link annotation
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144121e2435a---59718805176.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/32329531056.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/mirezu.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109190147362136.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/47127003148.pdfIn PDF document text
    • http://ridendo.cz/files/file/kitumoxobojuzeb.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/3121095088.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/56060030555.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/86628634014.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/zomirola.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/60290691409.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/tomegob.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/xarolozefimifana.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/38002389323.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614bbe1ba471a---bamevobetuviwupabipave.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/timijod.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/xatizagibeganiveg.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1614330c81012a---watajugok.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405b8dd8a4b---gomimaxeme.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/17017195857.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/163108851267149789316.pdfIn PDF document text
    • 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_off0000d71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71C 18244 bytes
SHA-256: c089ea83874112927533caeabf51b6505f507f9d76580e441fba78d08932ab9a
font_01_sfnt_off000106fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F12 10692 bytes
SHA-256: 280b1b62705145fbcc48341489c4d5ebc39e926ed823d10cc25f97c5e4571931