Malicious PDF — malware analysis report

Static analysis result for SHA-256 6327eb50693f0226…

MALICIOUS

PDF

75.0 KB Created: 2021-09-19 13:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f02b7f69ac6f6364b3ea77e8ef9bada5 SHA-1: edf34ae200f7492dded0b35734dfce1c259f5113 SHA-256: 6327eb50693f0226e79687b2af9a1b60985787235402a9b9190e43c707da0832
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised WordPress uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and UTM parameters in the URLs points to a coordinated effort to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://philabc.ru/uplcv?utm_term=cheat+roblox+arsenal+2021 PDF link annotation
    • http://gr-chem.com/upload/files/jasefukak.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/65253769169.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/62554740822.pdfIn PDF document text
    • https://jamurgoreng.net/contents/files/keredikugejomagijexilu.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/76537593594.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/46840680207.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/19787759817.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb9d59c2cc---bibutulegerez.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/21508399055.pdfIn PDF document text
    • http://njxinbell.com/upload/files/fesuzexiweditupotawusuzep.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/75538546551.pdfIn PDF document text
    • http://adveotec.com/img/file/71134259505.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/99816346090.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/xopumuxetipotebakipu.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/wifiredumojuvizexitol.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/vekojafalokakivovudirude.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/30720582114.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/pikozegafifozodap.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/33916453057.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6969efbeb---wizabanukirubajikamotogo.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161452ea9eeedf---16760149288.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfe1e88151---sufafut.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021091207585447.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_off0000c131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC131 10680 bytes
SHA-256: 62cd789c684f8e04d8cdd5bc69fcf42ea89377b1f02f47c92eeb118efdd4945d
font_01_sfnt_off0000d9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C8 17308 bytes
SHA-256: 33d5fbe0a6d9d868fec7900d27eae62655b477b41c2be5afe4413d193abbb3ac
font_02_sfnt_off0001065b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1