PDF malware analysis — malicious · f1042cd81fdc7691

MALICIOUS

PDF

85.1 KB Created: 2021-07-03 21:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: f711dc4d6cef98121181132583d1b3a9 SHA-1: c079978577d4afbd4faada8c43ea3573d6b72cc8 SHA-256: f1042cd81fdc7691a6a3977d2161eb34d2fd728359c95fa417ff8f4ae86a67e9

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it is likely a phishing or trojan delivery mechanism. The file contains numerous external URIs and links to compromised WordPress upload storage, suggesting it functions as a link farm to distribute further malicious content. The presence of multiple distinct hosts and UTM parameters in the URLs points towards a coordinated effort to lure victims to potentially harmful websites.

Machine Learning

Nyx PDF Classifier malicious score 0.9780

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://crysiq.ru/uplcv?utm_term=my+love+by+westlife+audio PDF link annotation
- http://artecgroupservices.com/imagenes/file/50801834663.pdfIn PDF document text
- https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/312adb241346562633855dbf02ad6250/sosiromufu.pdfIn PDF document text
- https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/d8a57edb0d2eaf694c12a22bb72a5628/gopexedosotas.pdfIn PDF document text
- https://kopari.hu/files/file/damolofoxama.pdfIn PDF document text
- http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4912e40490---rofepawufefatewa.pdfIn PDF document text
- https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/7b913dc990928fab1bc8be275f95aed7/77507845472.pdfIn PDF document text
- http://albino-pitti.com/pub_img/file/86702899865.pdfIn PDF document text
- http://biotledlight.com/userfiles/file///pulaloxugepomofinof.pdfIn PDF document text
- http://metabolit-plus.ru/files/file/36502933572.pdfIn PDF document text
- http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1b9884857---wibonevabavi.pdfIn PDF document text
- http://sumtinathholidays.com/admin/uploadfiles/file/lojisosinupafejipo.pdfIn PDF document text
- https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/hcll5e3gabrk370lh3nlhgu57l/riwakasabe.pdfIn PDF document text
- https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e96f48374f---96585634810.pdfIn PDF document text
- https://fablab808.com/nbloom/fckuploads/file/ruxamu.pdfIn PDF document text
- http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/k5chg7f2uu727pugcdmb55ese2/tamafululixujoxir.pdfIn PDF document text
- https://beautyreviveshop.com/newerac2c/userfiles/file/vufotixuwikejopogasamubo.pdfIn PDF document text
- http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b02e7b75648---16091208641.pdfIn PDF document text
- https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/afca1de3a9eef928dbe94273bb491b97/rupuwitobekezadikasufisux.pdfIn PDF document text
- http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b273f346228---lezural.pdfIn PDF document text
- http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078be27f0c10---60961754071.pdfIn PDF document text
- https://unitjaya.com/contents//files/93206870648.pdfIn PDF document text
- https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/d12eebnrcnfrhm4s3a342q7rrm/xumijazuketujes.pdfIn PDF document text
- http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a72c1f8b647---59236211958.pdfIn PDF document text
- http://bowlinggreenhsclassof66.com/clients/b/bd/bdf8ab256cd88a603fc2b95a051c5839/File/94502733365.pdfIn PDF document text
- http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6b419cdd2---89630219823.pdfIn PDF document text
- http://lamachine.nl/userfiles/file/54022182184.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000cd13.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCD13	10640 bytes
SHA-256: `121b3acc41ff696ceeccede7ff0c42d5ad8635e1faabff5cbd28a2a13ba9bcf0`
`font_01_sfnt_off0000e5a8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE5A8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000fdba.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFDBA	20800 bytes
SHA-256: `d2a530bc2fde4379590a6124672ebce6e49880e3f190b01d3aa4c02f8ec3007f`
`font_03_sfnt_off00013135.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13135	16144 bytes
SHA-256: `fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516`

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