PDF malware analysis — malicious · a55f58f8b63d29c7

MALICIOUS

PDF

94.2 KB Created: 2021-09-01 17:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: ca2808d3df8207cca391fca607aae7c6 SHA-1: 97e6788ab5d3b8e13c9c5a39a44e655e6bfdaf0b SHA-256: a55f58f8b63d29c78d85e43dccdf993a6b557843aee02b8513b37a65c41a3136

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains a link farm pointing to multiple compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content or for SEO manipulation. The presence of numerous external URIs and link farms indicates a phishing or malicious redirection attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9977

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 http://studiopol.it/userfiles/files/nurabamamuxonexijoze.pdf In PDF document text
- http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a67895b362d---fonatutunenogiz.pdfIn PDF document text
- https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/8e7a309683561a3f36976827276f399e/puturofe.pdfIn PDF document text
- https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/c64a987027cb5bbbb8d39923ed240d50/67134199372.pdfIn PDF document text
- http://afghansolar.com/userfiles/file/51323066956.pdfIn PDF document text
- https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/d087fbde79c3d446debbd1c0793b7ce8/jamapuwu.pdfIn PDF document text
- http://fly.no1-yes.com/userfiles/file/80429786447.pdfIn PDF document text
- http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecc585d192c---xarevuvopunadiwuxo.pdfIn PDF document text
- http://innova-perila.ru/upload/files/22884919536.pdfIn PDF document text
- http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bab3466b7de---8290582420.pdfIn PDF document text
- http://bahtiyardishekimi.com/fckfiles/file/napalepapikol.pdfIn PDF document text
- http://msinziniering.com/userfiles/file/jefewi.pdfIn PDF document text
- https://vietnaminsight.biz/ckfinder/userfiles/files/81124833761.pdfIn PDF document text
- http://shriramashramps.org/userfiles/file/fususisapapev.pdfIn PDF document text
- https://consurs.ro/ckfinder/userfiles/files/87618276368.pdfIn PDF document text
- https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/0n7c3ima870jef9h44gr0m4kkd/gavekivefabifaxozala.pdfIn PDF document text
- https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c99769e7223---panefofonogidat.pdfIn PDF document text
- http://vln.nl/files/file/vokosadaxokaduwoteviz.pdfIn PDF document text
- https://businessservicesuk.com/userfiles/file/waxawutowipenezuvudaruve.pdfIn PDF document text
- https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/b16a5938537b6bd945ea763daa223aa5/zulofusedoloxeb.pdfIn PDF document text
- http://fobosgrunt.ru/files/ckfinder/files/48052879354.pdfIn PDF document text
- http://chronicles.ae/userfiles/files/85901235698.pdfIn PDF document text
- https://zweefvlieg.net/userfiles/file/pegefowevogowujijipojibu.pdfIn PDF document text
- http://alphasigmaoverseas.com/userfiles/file/susawusabiwinemuxomepek.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=hp+officejet+5610+all+in+one+printer+manualPDF 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_off00010594.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10594	11168 bytes
SHA-256: `cfc9bb14c0a288163f8bcceee71f8f4f873716bfa5aa10292a27a94b60254a1d`
`font_01_sfnt_off00011fa7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11FA7	19144 bytes
SHA-256: `3e848a5240003f75985fec1d2cb9f405a6bee97ca547e195304b395efdb41b24`
`font_02_sfnt_off000151aa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x151AA	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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