PDF malware analysis — malicious · e4dd845518a026bd

MALICIOUS

PDF

119.3 KB Created: 2021-08-02 09:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: b0011e8899b1b827f4fc4d43242c4f74 SHA-1: 83471ff0437dd42d7adedba4fbfbb4777104c224 SHA-256: e4dd845518a026bd8dc5bdce64570c28ac5279e5cd5d75abdf387bb49c931e7a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress sites, suggesting it functions as a link farm to distribute phishing or malware. The presence of embedded URLs and the nature of the heuristics point towards a phishing or credential harvesting attack.

Machine Learning

Nyx PDF Classifier malicious score 0.9988

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://queure.ru/uplcv?utm_term=christmas+carol+charles+dickens+book+pdf PDF link annotation
- https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af7d630e9b---rixufaxerixiwod.pdfIn PDF document text
- https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949b5860647---wefiwedizakaraxojido.pdfIn PDF document text
- https://lamaisonducoeur.ca/upload/editor/file/67848503202.pdfIn PDF document text
- http://www.vljainandco.com/userfiles/files/14626190749.pdfIn PDF document text
- http://mytmbc.org/fckimage/file/xudutowesexo.pdfIn PDF document text
- https://lazerom.pro/media/file/24084855459.pdfIn PDF document text
- https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/rtu02jj5d69d8itco481n3c00c/34280318973.pdfIn PDF document text
- http://ajisushionline.com/uploads/files/48427877773.pdfIn PDF document text
- https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/63nlktej8aaedo5mheelg9ltml/boxufenanaperafojabirax.pdfIn PDF document text
- https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/ace16f4b07239ad67bb1aba4cae87152/69764880568.pdfIn PDF document text
- http://tubietelbar.hu/uploadfile/55849804149.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608802dc5311a---67808969866.pdfIn PDF document text
- http://historia-bfured.hu/userfiles/file/lajowekikubupekozinun.pdfIn PDF document text
- https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/f9rr0e5uis13rv1l01tn2b5fu7/96347922872.pdfIn PDF document text
- http://designbeginnings.com/upload/file/ziwupabiromemepevor.pdfIn PDF document text
- https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/252c065b5c27bf203f318b0280762861/gilusagozusosupoloxopi.pdfIn PDF document text
- https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/qs8c3046bm03c571fbof13df7p/dosugufavigavatot.pdfIn PDF document text
- https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c4bbcc6ea---risudesume.pdfIn PDF document text
- https://bodymart.in/ckfinder/userfiles/files/lezalogusivuxijopu.pdfIn PDF document text
- http://chargers68-50th.com/clients/3/3d/3dd154274af4887fbe356f6dcfc18689/File/tobakubivilawidupu.pdfIn PDF document text
- https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/i9psf3q4fe92dm11cl28mn2hn0/wuzidanewofunim.pdfIn PDF document text
- https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/8e4529440042101d34ba4a52f55b31ae/vosenitisapej.pdfIn PDF document text
- http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc00b87d03---jotefetowos.pdfIn PDF document text
- https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160999dc124197---64107883915.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00016fe9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x16FE9	11148 bytes
SHA-256: `83bbff7bda0cd77e726aec579d336f947d810e5d35469418efe24c0841410da2`
`font_01_sfnt_off00018993.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x18993	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001a1a5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1A1A5	17284 bytes
SHA-256: `4b1f6d5b6923948c419b18b5abfb192696f59c70a9495e998efdf757665e1eec`

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