Malicious PDF — malware analysis report

Static analysis result for SHA-256 e15cfaf43b51a53f…

MALICIOUS

PDF

72.1 KB Created: 2021-07-03 14:25:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b1acc1e12c8965252b2313a4f4c9cf2b SHA-1: 73c10cfe5f333320398f39faccecf43eb24dcb46 SHA-256: e15cfaf43b51a53f028891ebd3f28fbd42e97b083abbb99020e5457d0d317d8e
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting domains, indicating a link farm designed to redirect users to malicious content. ClamAV and ML classifiers strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://airelimpio.mx/img/editor/file/bamogelenibuverivetaneva.pdf In PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/48538513382.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3142629b6---60441877880.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/buxowe.pdfIn PDF document text
    • http://azizolace.cz/images/file/zilopapudadulopemolakalol.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/8mep1f967h076likb62qeg6873/80445007501.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070749a249bb---89863292090.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/30052448436.pdfIn PDF document text
    • http://harveyfamily4016.com/clients/5/51/51a16c7d09a65bdad6d3cd8ef7da6b4e/File/pesozuladalepowatoxezagu.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/168db4814574ddee7bf84d46ef69c8a4/xasasipujixo.pdfIn PDF document text
    • http://icwest78.com/clients/67591/File/vukaxokozowevivugokuv.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/febagijegekawur.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4668b7c856---24560480615.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/99730649012.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/5682588382.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/36725157202.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/uppnm1j10l6fkiv7hardm47503/jivegog.pdfIn PDF document text
    • http://geonatlife.es//ckfinder/userfiles/files/60475573809.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/80808398193.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/ebc916706bed147d4887219d2405e989/gurunupukevixokajaza.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/b5ee4a8c476f6a0c2071d6044a02723a/rudurobajamunemej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=the+craft+previewPDF 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_off0000bac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC5 10256 bytes
SHA-256: 5a32e123e21d273b6df33ff52b1dc4414ee4db1fcb4ac85571a0aaa24a4e646c
font_01_sfnt_off0000d208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD208 16072 bytes
SHA-256: 42b3eef0844f2f59943e440c3958cc5513f17fcf6b8eaf8d25b3c3f6540243e1
font_02_sfnt_off0000fb91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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