Malicious PDF — malware analysis report

Static analysis result for SHA-256 102f3c6811f39e9e…

MALICIOUS

PDF

77.5 KB Created: 2021-09-15 14:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1a07743ae84ec4d19371d149c96df803 SHA-1: 4a813b0a4bcf997e61b8da5928f557d23f9d78a7 SHA-256: 102f3c6811f39e9ed0d33f6e3d6f01f5235e64ddca0ff9d508667cf40c8022bb
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://villkasz.hu/editor_up/podavera.pdf In PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dotabowa.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/resigoxazada.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16131e27564c90---48679430325.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/jatutugupibemitajadizep.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/regivubefujujawuguvijewux.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/89398102883.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/pesewavisi.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/noxolumirusa.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/wiraxulajuj.pdfIn PDF document text
    • http://ranch.pl/files/file/13967266047.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/lezivobomi.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/48358637101.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/panamekisapimidusebodek.pdfIn PDF document text
    • http://client.diffuse.info/files/68266918339.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/vapenivob.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e2bcd71fc---waboxugofas.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/78667158477.pdfIn PDF document text
    • http://origo.ws/userfiles/file/netajudebubodil.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390129d7815---pipodepizam.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/f18bcadfeaa2e77767528b91d3bf8ed1/bekivusimukujes.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/gebenajedexu.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/bunarolufebemejafatowit.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/45793732279.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=paw+patrol+pups+save+the+winter+wonder+showPDF 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_off0000cb98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB98 10744 bytes
SHA-256: a5668d848f80338072ad2ae4980a38f780c59c536edd4e08cdaea186c66e5acf
font_01_sfnt_off0000e44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44C 16784 bytes
SHA-256: 417b65b809559d97fb0b5491ea43b443fe40130a69ce5bf124f983c4d58ff9b3
font_02_sfnt_off00010fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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