PDF malware analysis — malicious · 3607ba7771d1c9fa

MALICIOUS

PDF

75.3 KB Created: 2021-09-13 10:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 14527ea113561a1919070c25b0acb6b5 SHA-1: a53643e2438ec152a6c481f753b3fda653641f30 SHA-256: 3607ba7771d1c9fa38608e8ce45f53ef0b8fb6494f82d0562602a8d07aea08cc

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting a phishing or redirection attempt. The embedded URLs, while numerous, do not provide a clear second-stage payload, leading to an unknown family classification.

Machine Learning

Nyx PDF Classifier malicious score 0.9908

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 https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136485e80097---34381563140.pdf In PDF document text
- http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eeecdd46b7---zulenigavexixesupadowite.pdfIn PDF document text
- https://dnm.tw/uploads/files/202109010053502326.pdfIn PDF document text
- https://bandotrading.it/uploads/file/nanuze.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee815442fb---61034377480.pdfIn PDF document text
- http://taxplus.in/images/contentimages/files/95136309408.pdfIn PDF document text
- http://derp74.fooden.com/UserFiles/files/nuzigesanenoxilugifodogub.pdfIn PDF document text
- http://rilta.net/userfiles/files/62271018845.pdfIn PDF document text
- https://turkuazhost.com/calisma2/files/uploads/tobajaxufikig.pdfIn PDF document text
- https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf4cbc4645---xufulaxu.pdfIn PDF document text
- http://soles2walk.com/data/file/vovirixuwafepilu.pdfIn PDF document text
- http://thamcohoaian.com/webroot/img/files/16971126933.pdfIn PDF document text
- https://specializedfacilitymgt.com/public_html/userfiles/file/naxub.pdfIn PDF document text
- http://karimeh.com/public/userfiles/file/xilasadegofafovoradotob.pdfIn PDF document text
- https://steklo-shik.ru/userfiles/file/sowejusakal.pdfIn PDF document text
- https://adesso-moosburg.de/images/file/devilirizosugijejevinuri.pdfIn PDF document text
- http://familiehollander.nl/images/uploadedimages/file/donaxixogujivavipojo.pdfIn PDF document text
- http://narnivet.com/userfiles/files/xawowapiwatelebikemurowok.pdfIn PDF document text
- https://detmers-kontejner.hr/files/37929233209.pdfIn PDF document text
- https://office-agglo-larochelle.fr/userfiles/file/matarufavo.pdfIn PDF document text
- https://khonggiansachhanoi.vn/uploads/files/pimuxufolusumemitizup.pdfIn PDF document text
- https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/q1avvegd2ug5uf7p9qms5bp0sb/dogudanenozezake.pdfIn PDF document text
- http://simkoongschool.com/uploads/editer/files/13223115968.pdfIn PDF document text
- http://autowagon.it/userfiles/files/xijademurid.pdfIn PDF document text
- http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/80502518615.pdfIn PDF document text
- https://presstone.hu/userfiles/file/119597869.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=top+5+games+for+androidPDF 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000c133.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC133	17564 bytes
SHA-256: `936a01b0bf1d40f89f9193a7617baf69dc09248209ce363080dc17fc995287e5`
`font_01_sfnt_off0000eea3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEEA3	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000106ba.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x106BA	10796 bytes
SHA-256: `4368f8f54b884ff20cac89847da8c4118b5c3b23417ecaef8fa6f3af60f4a6b6`

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