PDF malware analysis — malicious · 1a1bfa10d52b69a1

MALICIOUS

PDF

86.7 KB Created: 2021-06-26 15:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: caa0ebca37a673c79460c5009c91e61f SHA-1: 86fa8b497d1458591b44532cfd27f5253d6fecb0 SHA-256: 1a1bfa10d52b69a1c5e2f9e77f52d6dc32504a8e6597c10e5371b9f950cd6928

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains a large number of embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed for phishing or malware distribution. The presence of external URI heuristics further supports this attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9848

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 https://smidgel.ru/uplcv?utm_term=dr+banting+and+best PDF link annotation
- https://sailstudy.in/ckfinder/userfiles/files/65878702509.pdfIn PDF document text
- http://alexlunacoach.com/img/editor/file/zipifiwiwitewobadi.pdfIn PDF document text
- http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160983c6550713---50814357327.pdfIn PDF document text
- http://www.medicellbank.com/userfiles/files/xelalakatiwepebimuku.pdfIn PDF document text
- https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/rsu1403ni7vi0jqshm3fv81mg7/kisuf.pdfIn PDF document text
- https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/466e6f6c2778f96d9fdcd382a0fd6d85/75213683133.pdfIn PDF document text
- https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e6a769897---95301314570.pdfIn PDF document text
- https://electrabicycles.pl/app/webroot/uploads/file/16201816128583.pdfIn PDF document text
- https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c0764ef11---vikajewowazukasesas.pdfIn PDF document text
- http://eprdel.cz/userfiles/file/lases.pdfIn PDF document text
- https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/5lf74tqpld2v5vi5afa7usbgfi/77701205000.pdfIn PDF document text
- https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/15b21b35f0c644e0a6dfbd9f2e0c9d42/zaxizilafakebuvonig.pdfIn PDF document text
- http://yilip.net/userData/board/file/3169743696.pdfIn PDF document text
- http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1609a397adba90---19225252585.pdfIn PDF document text
- http://studiocalderini.it/userfiles/files/91552475710.pdfIn PDF document text
- http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af95bd6bed---kurusubunovitomu.pdfIn PDF document text
- https://samarpanbharat.org/trila/userfiles/file/10964917901.pdfIn PDF document text
- http://saharun.org/uploads/ckfinder/userfiles/files/44582978036.pdfIn PDF document text
- https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/964599c3850c921ff7c30c03962eaf6f/12543887009.pdfIn PDF document text
- https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798126a4471---55658812120.pdfIn PDF document text
- http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54591c563d---logerisawuze.pdfIn PDF document text
- http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6155ba413---53283018060.pdfIn PDF document text
- http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8fc94bfd5---tisitazamufe.pdfIn PDF document text
- http://toicodonlyson.com/uploads/files/woxevazo.pdfIn PDF document text
- http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608bffc49b9b4---28691860784.pdfIn PDF document text
- https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/805c9f96a42902173c216e8e67989eb9/8404482308.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_off0000f01c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF01C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0001082e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1082E	18724 bytes
SHA-256: `6891797c27b1bba9c3d7e24c91a3fcd3b4abd522a62bd835edff7f333ca5c1d6`
`font_02_sfnt_off00013624.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13624	10396 bytes
SHA-256: `320a019dae01f776e11dd307658bfe3dd62509a846b174d970a5d764c1d53da3`

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