Malicious PDF — malware analysis report

Static analysis result for SHA-256 887f24c4cb1431a6…

MALICIOUS

PDF

77.4 KB Created: 2021-09-07 23:02:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 260745f1bcd96935c977e3cf47b87e6f SHA-1: 510b5143965c9252f72e23199609c296dfc20b3b SHA-256: 887f24c4cb1431a6bdbcbf704ee398a6a6592e1ebd30f0017e005c26ca25762c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing pages or download further malware. The presence of multiple link farms suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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=worthy+is+the+lamb+pdf+g PDF link annotation
    • http://instandee.com/Images_upload/files/dupibi.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/63689d90315229f557c3c1a9814680fa/68993012324.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/gezukorodaderojaved.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/n6p0i2trrfqk6ksie5b1jdeq97/59001477737.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/51403977249.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/65878247498.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/81503086923.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/17792235195.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/5054f7b1eb81389529938c3b10752bd1/92646289405.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/5843d1043cc9341ba2388ace5a55755a/fekujobozojudezupigure.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/35959080309.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/nanaxiw.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a849cfc68---91723160049.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2e0c7b7a8---vimonavonunif.pdfIn PDF document text
    • http://andrewsexes.org/clients/867461/File/gudirodakosixabe.pdfIn PDF document text
    • https://taxiporec.top/wp-content/plugins/super-forms/uploads/php/files/s0aff3gnkno3tknlo78omb0dtn/vobowuwupevi.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c151f77a585---54920142063.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/74918896240.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/22744088096.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/30186520694.pdfIn PDF document text
    • http://hydrem.ru/images/file/44563640161.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c6965d435---zulunatix.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/9c12f43a776f3f4e529498e42bd18123/nevenafef.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/sfur08k7igi4ml30q75b6ptqac/zevovidakig.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/khs9s39nl11ec8esht3o672fv0/kiwopatupoteru.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_off0000c941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC941 11088 bytes
SHA-256: fdda953bce7d5f372fc502ca587180db1474e48dc4eca02db3c2eaf3432e3014
font_01_sfnt_off0000e2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AE 17616 bytes
SHA-256: 88bb15124738eea45a1e8af5bbd1edf4f7e9c807d0d495b14a49efec1777d57f
font_02_sfnt_off00011052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11052 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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