Malicious PDF — malware analysis report

Static analysis result for SHA-256 14c35d7f3974474b…

MALICIOUS

PDF

81.7 KB Created: 2021-06-26 21:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: be832a6503558759430bfe0e04324b0e SHA-1: 0da227ed91007933a39660b6a4fcac5bfb9bf388 SHA-256: 14c35d7f3974474b35d293f17751fea0bddf2c537b7804f29712d6e971533292
156 Risk Score

Malware Insights

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

The PDF document contains a large number of links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for SEO poisoning or phishing campaigns. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://autohondl.cz/userfiles/file/gojizopekutafifaravu.pdf In PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/7a4a6d40cf87043635ba470874ab8bb5/90576518663.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/94734884149.pdfIn PDF document text
    • http://bendhigh1970.com/clients/1/10/106e6567aa8bd3cecf4080670b11bd10/File/4344105531.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/gumofabakemaj.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/222be86e65bedd1774cef4f8f0b2fbb1/zumotijutukififeped.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/fivogeliguzunufaxofag.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/74141258036.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160961018652c9---94331628537.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608975ee9af97---nuxilape.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b767c557fc7---dusememajerevefutesav.pdfIn PDF document text
    • http://myexamadvisor.com/fck_uploads/files/56369817952.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/36288869261.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/72488027406.pdfIn PDF document text
    • http://instandee.com/Images_upload/files/jefiken.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/4a033598167881882b7726695af78f80/6445652519.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607875872db6f---mabowusumo.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609412254bcab---15616726102.pdfIn PDF document text
    • http://rayzerfamilyreunion.com/clients/0/08/08e2d5bcffca37c2e1a82d364f4296c6/File/relubosimejelufor.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/sutotokewiku.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/43837085238.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/538d9384c7a89142e15784d2b683d71c/sokivimuvolusafozinunol.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/act0incfjair3oapmffn6a9tqf/26631230196.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160caf47d5f7ab---faxavif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+find+amplitude+from+graphPDF 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_off0000db8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8B 17216 bytes
SHA-256: cfe23a075863bcdb5c02f6b9ab0e8e3880872119756b1538a3a8a033eec5d5c7
font_01_sfnt_off00010852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10852 10952 bytes
SHA-256: 02b1ee1e77b77a7630cd38e3754704709c6d2b6ebaa5d2021475dd9d9c59e4b4
font_02_sfnt_off0001213f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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