Malicious PDF — malware analysis report

Static analysis result for SHA-256 884aa256d33f6d26…

MALICIOUS

PDF

84.4 KB Created: 2021-09-12 19:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 821b7b88df2ff247d93a524fb33b37a1 SHA-1: 58e0fde8d6ec6b6d7b779b88d0c953441d879dfe SHA-256: 884aa256d33f6d261ef02361df7da1d6d59b0b5269bbec468afc935a767b05f1
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple domains, several of which are hosted on compromised CMS uploads or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and URL patterns are consistent with a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133757489cde---2428812146.pdf In PDF document text
    • http://ulv-fogger.ru/d/files/90491004757.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/molagujisuduseneza.pdfIn PDF document text
    • http://orel-trinity.ru/sites/default/files/file/rerononitexelemelisefex.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/wikanigofitewitibuz.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/tetugebol.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6520652e8---92569308488.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/24641495869.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137dd024de2f---pedoxavesefatuwovijuwu.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/safovatuwexureko.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/sefuwaxogoxedefobu.pdfIn PDF document text
    • http://yuha.be/_files/file/21953581691.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/temegu.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/47829133211.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/xavosubumawubizepisulaxu.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/forodutelugiju.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/79982804830.pdfIn PDF document text
    • http://hidramaco.com/files/files/47138782118.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/dejalerabutisujaxekod.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210908_150034.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/69752476608.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/39565667673.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/gevekat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=the+best+android+launcher+2021PDF 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_off0000e440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE440 10964 bytes
SHA-256: be4512640b8a04c19395fffe9b9c4c726d656792adb5f00cd703ccbf17d07d5c
font_01_sfnt_off0000fdae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C0 17716 bytes
SHA-256: d4056fae93f71e99925b1e31d7d927b33de1da7cc0b19a7dd3cd7ac4d917fd49