PDF malware analysis — malicious · 1cfbba424bfb11d7

MALICIOUS

PDF

83.7 KB Created: 2021-09-19 08:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: c99af7d74bbc2f7a76c164419c0d5441 SHA-1: 9949a31e192f6629a4776ba1f3c48a6721d74158 SHA-256: 1cfbba424bfb11d7c07edb7bad38b894a2e43c6d5abe92b1bea02394ce7102b5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of these links indicates an attempt to redirect users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=cara+membuka+aplikasi+tersembunyi+di+android PDF link annotation
- https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da6c90737f---25840107204.pdfIn PDF document text
- http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403cc6e07d0---68942540952.pdfIn PDF document text
- http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bb0c88b86---60389005648.pdfIn PDF document text
- https://dollarplus98.com/images/upload/files/lijuw.pdfIn PDF document text
- http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16141906af25c0---10580499945.pdfIn PDF document text
- http://www.ondebiz.com/userfiles/file/75772063678.pdfIn PDF document text
- http://kooijobs.in/ckfinder/userfiles/files/monuxibilo.pdfIn PDF document text
- http://urjabatteries.in/userfiles/file/28358714782.pdfIn PDF document text
- http://gmei.lt/ckfinder/userfiles/files/miloperixiduvojot.pdfIn PDF document text
- https://elesud.it/img_pagine/file/jegonutitenefiwipag.pdfIn PDF document text
- http://cukiernia-waltar.pl/qcms/userfiles/file/14547997924.pdfIn PDF document text
- https://szabobuszrendeles.hu/files/files/83323538520.pdfIn PDF document text
- http://taihegas.com/filespath/files/20210912232703.pdfIn PDF document text
- https://ourcampuswindow.com/ckfinder/userfiles/files/3920401383.pdfIn PDF document text
- https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/jukisigis.pdfIn PDF document text
- https://dubaimotorcycletours.com/uploaded_images/files/50825925687.pdfIn PDF document text
- https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8ec338b86---8777036449.pdfIn PDF document text
- https://bharatceramics.in/ckfinder/userfiles/files/sufazilinowuj.pdfIn PDF document text
- http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/161461dba85886---11056213718.pdfIn PDF document text
- http://oldmotorsclub.com/files/file/golazurakowanuw.pdfIn PDF document text
- http://urgentcarepb.net/userfiles/file/30699544699.pdfIn PDF document text
- http://sxcec.org/userfiles/file/keledifudugadulinimud.pdfIn PDF document text
- http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/665d9f7da89a35ed3b99c23dfdfd9aa3/muzowudodinozubufurajidek.pdfIn PDF document text
- http://2rent.gr/userfiles/file/jagakuxesejiledajine.pdfIn PDF document text
- http://siamsankyo.com/Uploads/file/99737541201.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_off0000e309.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE309	16832 bytes
SHA-256: `ceb35f5ee212eb382cef62cbd986766922e6eeec0bab5e7facbd9a535c976cff`
`font_01_sfnt_off00010f26.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10F26	11028 bytes
SHA-256: `7b19bcde9997aa96133bb80a1a6848c855143113914963c596ba95d41d032d4b`
`font_02_sfnt_off0001289d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1289D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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