Malicious PDF — malware analysis report

Static analysis result for SHA-256 dce0ea42f2210415…

MALICIOUS

PDF

80.9 KB Created: 2021-09-08 08:38:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5e920ddf6424979ab56b2dbfc27d5dd6 SHA-1: 65ea94f1d532e790abaa86a0a737f4d1595d44ed SHA-256: dce0ea42f22104157e4ec3fb18a18e891057f099b4b754427310f7df51acaec1
176 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, some of which are identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URI heuristics suggest it's designed to lure users into downloading further malicious content or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://baongochoa.com/upload/file/dofoluni.pdf In PDF document text
    • http://ongxoanhdpe.vn/upload/files/xadavul.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/zixiwor.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/87367487168.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/52026058517.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/febafomodigirijadel.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/gapijodolibowatenat.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d671e943df---kovobi.pdfIn PDF document text
    • http://halaljones.com/uploads/files/60279528219.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/65439775694.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0962840e9f---faraxoxon.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/94053532740.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/wumuganixa.pdfIn PDF document text
    • http://sdds.be/userfiles/file/25163093402.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/35343017888.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7d75ec5df---zavakotivulosedixamotejej.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/1a38c1017b480631f39f94b152c7264b/98084258571.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/90056511400.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/69581814265.pdfPDF link annotation
    • https://singlespeed-switzerland.ch/userfiles/files/27338425441.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c7d2ef601---wuvatevobexabunubunojovif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=pdf+reader+androidPDF 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_off0000da5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26D 17520 bytes
SHA-256: 00b8194911250be274101125dd15db35d58b56ddfacf609c9852880d9aab8ff7
font_02_sfnt_off00012016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12016 10036 bytes
SHA-256: b60772f3871c3e562b2dc9e535b1e74fff4e71d17352d58f78c6451db810d64f

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