PDF malware analysis — malicious · 4d4dc164d6007026

MALICIOUS

PDF

80.7 KB Created: 2021-09-02 08:28:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 6a7bb51f2fba0bbd95a19966b358cbf4 SHA-1: e00c22edfe7796d076261eb25c787d1ecec42182 SHA-256: 4d4dc164d600702649768a4fbc51fb0e2404def1a88e9a01b944e41e39fa0ff4

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute phishing or malware. The heuristic 'SE_URGENCY_LURE' indicates the document may attempt to create a false sense of urgency to prompt user interaction.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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
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.
Urgency / deadline lure low SE_URGENCY_LURE

Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
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://philabc.ru/uplcv?utm_term=house+taken+over+questions+and+answers PDF link annotation
- http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160828b4e3fc15---73772259339.pdfIn PDF document text
- http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946192c36eb---wopuwizoguligemejiwijer.pdfIn PDF document text
- https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/69c132bd4d3acf5609c7e947064f8934/3520626691.pdfIn PDF document text
- http://netshopnepal.com/userfiles/file/82741837653.pdfIn PDF document text
- https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a683257b389---6445474523.pdfIn PDF document text
- https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/4edcf99b0b7662dec1472419603dff00/4032825323.pdfIn PDF document text
- http://hoachathoanggia.com/userfiles/file/42630824824.pdfIn PDF document text
- https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/beb9dff3b54d37a1aec15d5f3ee91734/87067218671.pdfIn PDF document text
- http://apvn.info/userfiles/file/48798463211.pdfIn PDF document text
- https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/ooe6unsgtestdq2to89d1kfas1/vebalidapatetakodo.pdfIn PDF document text
- http://www.jucadent.es/ckfinder/userfiles/files/94119837426.pdfIn PDF document text
- http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b82aa4f1c---60581236207.pdfIn PDF document text
- https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/8c65e92bcc1c552ad1b9b73cc292120d/48188189494.pdfIn PDF document text
- https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/e69fe1cc0a21e3ba41e0f8e6bee88a69/xobiduzovak.pdfIn PDF document text
- http://standardamulet.com/files/files/46686394268.pdfIn PDF document text
- https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7c5aa60ff---95002962644.pdfIn PDF document text
- http://sanarina-coaching.de/ckfinder/userfiles/files/venadosag.pdfIn PDF document text
- http://hzdsbg.com/uploadfile/1626098513.pdfIn PDF document text
- http://german-ex.com/images/blog/file/68057358792.pdfIn PDF document text
- https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9fbd1ab3dc---8842528038.pdfIn PDF document text
- http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/830766ddb5756c4d4049beddaf22e5c2/kadenepujulalajonixu.pdfIn PDF document text
- https://angkalaris.com/contents//files/26683367857.pdfIn PDF document text
- https://yaslibakicisi.net/userfiles/file/lumumekosebuxezif.pdfIn PDF document text
- http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f1769be00---65017676667.pdfIn PDF document text
- 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d758.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD758	17424 bytes
SHA-256: `982882d6d2f8328bbb829ef9da3aca92b2e47dedbf468d9b93ce5d9963acd6d9`
`font_01_sfnt_off000104ad.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x104AD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011cc4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11CC4	10676 bytes
SHA-256: `55df41ace6999743c8e32cefcdcd4d63011b0208c6d1bfd5ad99e1238233c767`

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