Malicious PDF — malware analysis report

Static analysis result for SHA-256 f67d089f8c3f8cf0…

MALICIOUS

PDF

81.5 KB Created: 2021-09-09 16:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bca5d7109f423beb45b68b815d39a329 SHA-1: 87a1eb08196f03cb85bf1a91e7c3b90a62650119 SHA-256: f67d089f8c3f8cf02b99b5aed897689ec954a07f74c3aaf32cf92e11fdce200e
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=shahid+vip+mod+apk PDF link annotation
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/9890591c4ce7ea62a5f079069f78cd14/12909476953.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c4efdd99b---xumuvar.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/52043767954.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/gonuzozoletaditisaweku.pdfIn PDF document text
    • https://ckmandarin.com/uploads/vitikamunebab.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/remalisulexotabupijo.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/42381202834.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210904231227.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/pikevenifedegosozisa.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/vopiju.pdfIn PDF document text
    • https://hssanesteban.cl/files/58018811618.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613527b283011---3787237945.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/nuwenola.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/51614783650.pdfIn PDF document text
    • https://ip-pharma.net/data/files/3473722939.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/fepalemebog.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/23055815438.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/kivuxav.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/52409706546.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/punedefagiratomenizoxebab.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/25531727864.pdfIn PDF document text
    • http://biomehl.com/images/content/files/549848062.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/kjkaphdm38nrderdncqr8u56u1/79058434416.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fc9d35e32---togunusomijate.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_off0000d5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DE 19524 bytes
SHA-256: d469241e68bafa08a7956dad59fd6f6ddc3bb3c846f02fae599ae3b73ce95230
font_01_sfnt_off00010828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10828 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001203f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203F 10244 bytes
SHA-256: 9cc11d1363a18c4025c32d33f80b423d6383dcbd4e7c2e2b17cf174fb26bcd74