PDF malware analysis — malicious · 597aa3b5d0032721

MALICIOUS

PDF

69.3 KB Created: 2021-09-07 18:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 42d5b2b5e71c2931679e6d18ab529081 SHA-1: b48212ad7567daa77748e829f6b8d22698aed902 SHA-256: 597aa3b5d0032721a84676c54fd2cd4573d7e49e9e4a91d7402cc55431c35ade

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs that form a link farm, directing users to potentially compromised WordPress uploads or disposable hosting sites. These links likely serve as lures for phishing or to download further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.6489

Heuristics 5

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
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://inwebjor.ru/uplcv?utm_term=english+file+advanced+third+edition+pdf+teacher%27s+book PDF link annotation
- http://standardamulet.com/files/files/nukegagasak.pdfIn PDF document text
- https://hoongnau.com/upload/files/34371713530.pdfIn PDF document text
- http://uppercanadatwocylinderclub.com/clients/877835/File/70455334943.pdfIn PDF document text
- https://koratspring.com/upload/file/59853007035.pdfIn PDF document text
- https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5f9107c56d---foladetewutabiferinat.pdfIn PDF document text
- https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/caf5a5b1cf522bc7d952a3bd9c611834/ninalamupuju.pdfIn PDF document text
- http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cea5f92d45---sagezu.pdfIn PDF document text
- http://altaprecision.com/userfiles/file/konuwurepa.pdfIn PDF document text
- https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/g22ko1gcsllu5236i275u414r2/95013294424.pdfIn PDF document text
- https://9ja-bet.com/userfiles/file/mekomagizovire.pdfIn PDF document text
- https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608de9218162e---fepovumozuduxelewanu.pdfIn PDF document text
- https://loyallcanada.net/editor_files/file/81847963111.pdfIn PDF document text
- https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/55buabdv6clvs3fi2id4vir2ho/25538722029.pdfIn PDF document text
- http://risme.vn/files/87468327752.pdfIn PDF document text
- http://zrdb-drogbud.pl/Upload/file/pijajatefobeginolesixez.pdfIn PDF document text
- https://almoheetmanpower.com/public_html/userfiles/file/65980360930.pdfIn PDF document text
- https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/ut036c8q26csjfpdr6q6d86v7d/bigeduwapotum.pdfIn PDF document text
- https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160b165d947ab0---logasikejisizekudabexud.pdfIn PDF document text
- http://ldbell1965.net/clients/85689/File/vedapakexevib.pdfIn PDF document text
- https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/7ef66744c7c196995dc833231249a030/loxufabawagijofunoliseje.pdfIn PDF document text
- http://tetobox-budapest.hu/uploads/files/83200977452.pdfIn PDF document text
- http://harekatmemuru.com/images/Media/files/vuxovodepuwetosuxijazig.pdfIn PDF document text
- https://profesa.net/userFilesfile/dufofuluvuponobetatorake.pdfIn PDF document text
- http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/ghi9racjpvqa67j2q8h4qubor4/lefib.pdfIn PDF document text
- https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/03c5478e287893e9092d966c395aa4c8/49804544069.pdfIn PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000c8e1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC8E1	11216 bytes
SHA-256: `5997c9a1b0583016e57240275da7551721ba26284b6263597551012ec5f92e5d`
`font_01_sfnt_off0000e2ab.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE2AB	20572 bytes
SHA-256: `d09ab9c08358f394786d4d93f667886340e547242ce4724919def0eb70584bcf`

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