PDF malware analysis — malicious · a1683acd6be67c71

MALICIOUS

PDF

84.3 KB Created: 2021-08-21 04:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 729ce8926ed4496112f347478c9fbd4f SHA-1: 3f71a5ca4288e4541f97bff252fddadf02d1fade SHA-256: a1683acd6be67c713c71accd8f805e57ac64a29f78cb98326e3900c3f545f591

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a likely attempt to exploit users through deceptive links, potentially leading to credential theft or further malware infection.

Machine Learning

Nyx PDF Classifier malicious score 0.9909

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://dcmheavyequipment.com/admin/images/file/pepixadixorimowiviv.pdf In PDF document text
- https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/42d18436f9796c001c36f956fc990956/bugelifuwofis.pdfIn PDF document text
- https://dacinsara.ro/fckfiles/file/27459978787.pdfIn PDF document text
- http://suvagcentr.ru/userfiles/files/vuwiselamuvupap.pdfIn PDF document text
- http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160788704b137f---54815294954.pdfIn PDF document text
- https://rubin2000-distribuitorshop.ro/userfiles/file/duwafapipujafoj.pdfIn PDF document text
- http://hainescentreasia.com/images/file/kuvatilani.pdfIn PDF document text
- http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/9a32fc57d9c63a2968f3f7a039c0a945/sumoxurimidowetiku.pdfIn PDF document text
- http://micronforgacsolo.hu/UserFiles/file/wumawemuxikodoketotuxe.pdfIn PDF document text
- http://norilskgu.ru/userfiles/file/84662868462.pdfIn PDF document text
- http://thesprotia.gr/uploads/file/xagoram.pdfIn PDF document text
- http://peaceinsrilanka.lk/userfiles/file/41874145545.pdfIn PDF document text
- https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/kq9pvdq63h5ddbbr762mklsdef/fipamopilakuwosirovumupo.pdfIn PDF document text
- http://residencecarlofelice.com/userfiles/files/zofupupasiwixuradapefiz.pdfIn PDF document text
- https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/1h5d6j0j9joi1s87qc3n398f7u/65762359072.pdfIn PDF document text
- https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/625f4198bcb325b0582dde4b70f42c31/89666143253.pdfIn PDF document text
- https://vildmarksjagt.dk/userfiles/file/22173907568.pdfIn PDF document text
- https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/ae44bd3aa67ce82e7455ad576e73b4a2/wubese.pdfIn PDF document text
- http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a0d003269a2---kimorisazixurugozi.pdfIn PDF document text
- http://myapartment.de/web/editor/files/bapefo.pdfIn PDF document text
- http://change4best.ru/upload/file/95452872636.pdfIn PDF document text
- https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16079435185979---66888893205.pdfIn PDF document text
- http://lesen-und-schenken.de/userfiles/files/91115347254.pdfIn PDF document text
- https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/lc5lo03rq8k743r9ma4ghoqt94/bezanupinamupakoxez.pdfIn PDF document text
- https://lanhcongnghiepthinhphat.com/upload/files/94527424214.pdfIn PDF document text
- http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/2c7e887f25555833ab3708f375adfcd0/51030200585.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=isometric+circle+templatePDF 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_off0000e253.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE253	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000fa6a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA6A	10384 bytes
SHA-256: `a05733fa147e9c4be3b63d9d1a7ccbf4ee0135832b24ba5525197a917748b1c3`
`font_02_sfnt_off000111ef.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x111EF	18644 bytes
SHA-256: `f4ad91cef1c8801cb94813ba8eda6e65378c914139e5ef0a5ddb764cb2d5eebd`

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