Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1e95512e633a421…

MALICIOUS

PDF

81.9 KB Created: 2021-09-01 17:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cba94194d0eb4f3b9b61bf3b64a28159 SHA-1: 2cf684056f586d4b28ce611a4d24e5ffcee4db91 SHA-256: f1e95512e633a42131eadc652cd053d1473008caa6908af187dd292f98a24801
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, identifying it as a phishing trojan. It functions as a link farm, directing users to numerous external URLs, some hosted on compromised CMS upload directories. While no scripts were explicitly extracted, the PDF structure and link farm nature suggest an intent to lure users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 http://cmcthailand.com/ckfinder/userfiles/files/fimigureri.pdf In PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/ffcc5ffb66d360906c6d4a1528f9ebe3/fepaki.pdfIn PDF document text
    • http://bacsionline.net/userfiles/file/tamefapusagodixeg.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/df542b91e197512d387599f630b7a6e4/lajuzadojaniradej.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160846df3488b6---67010743545.pdfIn PDF document text
    • http://bwc.lt/i/lakidanevoga.pdfIn PDF document text
    • http://cosmickino.ru/sadm_files/27361139387.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/tixenegurifoxaxu.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/76373096226.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c96c4d6770a---viveg.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/ditidiguwolusan.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16078fc7952ff5---majeme.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/jenajugatixelugupomokimew.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/2021892241564024.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/zadezutetorefajijulu.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb83b9bafb7---86823460796.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/53941742411.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/9c9e1e27cccc9de9fabd807a69c29367/kemaxowemo.pdfIn PDF document text
    • https://bayihoki99.com/contents//files/64420416794.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/jumapabufojemogaru.pdfIn PDF document text
    • http://camera68gialai.com/uplaod/quangtri/files/dikinikujubikumuvaderiwal.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b325af30fa5---venim.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/749b3df96abad1da5177403d57087321/26119699806.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/livoboje.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bf266309848---80511855333.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/36315762236.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=pink+and+white+acrylic+coffin+nailsPDF 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_off0000dc8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8C 16760 bytes
SHA-256: 7b85983a958ff03a141d26ab01bfdb8fa69290f7d3324d7be33ed0d3064d552c
font_01_sfnt_off000107db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF2 10864 bytes
SHA-256: bdbdaf2da854e3ac3abcd6294aba2ea42009ba160670baa2d015cc3f09a7e94e

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