PDF malware analysis — malicious · 2c73a984c24101f8

MALICIOUS

PDF

79.5 KB Created: 2021-09-01 00:31:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 7c3c7035ce07763c41b4c7bf126e0754 SHA-1: c0ba000405f8521ba62c28fd0628365d60c87b00 SHA-256: 2c73a984c24101f85f8433cf942a9cfd0d0f9b5317043216ac63d5f894e9a149

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS upload directories, suggesting it functions as a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to distribute links across disposable hosting. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

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://nomylo.ru/uplcv?utm_term=charlotte%27s+web+guided+reading+questions PDF link annotation
- https://jackyrouxmethode.com/userfiles/file/94572488977.pdfIn PDF document text
- http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/3272029957.pdfIn PDF document text
- http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16127645821cbb---nikimib.pdfIn PDF document text
- http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/048877712ac4fe85325991068a6cf992/xesij.pdfIn PDF document text
- https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608016b2305da---fogipewisopulutimewuz.pdfIn PDF document text
- https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/b2b8a84b25edfe66c8933c46953bbe66/vadubiliraxegimunurasejo.pdfIn PDF document text
- http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1cb533702d---silisa.pdfIn PDF document text
- https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/eab747d6c92229330388e364ebd9f818/watunajarugalukomosage.pdfIn PDF document text
- http://sonnenheizungen.ch/fckeditor/editor/images/file/gawikorufimapaguni.pdfIn PDF document text
- https://nhatngudongkinh.com/upload/ckupload/files/mozitidijizikutafolelamaz.pdfIn PDF document text
- https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099132c16f6f---38678301650.pdfIn PDF document text
- https://jcmimoveis.com/userfiles/file/73170683908.pdfIn PDF document text
- https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/6ee0441fd6335e5cb8c6a6aa6318e842/topogexamedufut.pdfIn PDF document text
- http://mashhadgardi724.ir/basefile/mashhadgardi724/files/40601949998.pdfIn PDF document text
- http://cycling-software.com/files/file/wesuvuxijubijija.pdfIn PDF document text
- https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/5kt0kqpl7d05b6d1v4tk98sde4/rubepafavagelotum.pdfIn PDF document text
- http://danburyhighclassof1961.com/clients/b/b4/b42d7d7907ff1a67dd6fd366dd3c6775/File/86576830896.pdfIn PDF document text
- http://fandimnarodaku.cz/upload/file/bawinunomulurig.pdfIn PDF document text
- https://lawyerupsmart.com/tempimg/file/21568136873.pdfIn PDF document text
- https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/2845162874.pdfIn PDF document text
- https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/13522bef045396e1b30e04764469e3b3/gulelu.pdfIn PDF document text
- http://schokobrunnen.com/idata/vimesogon.pdfIn PDF document text
- http://phannhan.vn/files/usersfiles/files/sapaxazumumoten.pdfIn PDF document text
- https://mayxaydungthienlong.com/uploads/files/files/tikix.pdfIn PDF document text
- https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ejjbv2ue2mm7at6ml4sjqc57pj/83908436010.pdfIn PDF document text
- https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2f6360378---5362382922.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_off0000d120.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD120	17272 bytes
SHA-256: `27fd3cfdd65f380645d4ba7649b28efc11a0a87a0b7c4412ab843a96f79be1cf`
`font_01_sfnt_off0000fe1e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFE1E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011635.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11635	11064 bytes
SHA-256: `520058b092eefb7c66f063c299206d9fc8411f54bec9624d1f5261b2fcbe0126`

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