PDF malware analysis — malicious · d1685ca5b116aa2f

MALICIOUS

PDF

82.3 KB Created: 2021-06-27 21:33:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 349cf18df5b057a3075e29b464f8d213 SHA-1: 2a87e752b2ba20172d43b5aad708fa2a3bb7ff91 SHA-256: d1685ca5b116aa2f9af4578e6e1a7a0bd2612d895239e02c1f41ae40d2da393a

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised WordPress sites, likely intended to trick users into downloading further malicious content. The presence of numerous external URIs and a link farm structure strongly suggests a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9833

Heuristics 7

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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://crewmak.ru/uplcv?utm_term=applied+biopharmaceutics+and+pharmacokinetics+7th+edition+pdf+free PDF link annotation
- https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608266e5d465f---79371453399.pdfIn PDF document text
- https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/a3aa55331933f541149069b26fc9f95d/seselanibezatajurupolofe.pdfIn PDF document text
- https://auto826.com/uploads/files/jinewubuxobugodexelod.pdfIn PDF document text
- http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fe42afa29---66396027227.pdfIn PDF document text
- https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ba7aa3f93---pisofotejakogijoburiberi.pdfIn PDF document text
- https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/tkaat7pej6ekkr17g36ht4972f/68613081559.pdfIn PDF document text
- http://altinay-law.com/images/file/66430302204.pdfIn PDF document text
- https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/529bdbc1c3c484a25ee767c1a840fbfa/voxugufisowodiwuv.pdfIn PDF document text
- http://besttailor.info/ckfinder/userfiles/files/57835013704.pdfIn PDF document text
- http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/2cbc63pkiqtbkq3flllr4ocfn7/nexoxu.pdfIn PDF document text
- http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd18b8e212---jibekubitar.pdfIn PDF document text
- https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/ndl8inrgd8cnc855s4oma6jjt4/3658419000.pdfIn PDF document text
- http://skrabl.pl/www/rpbd/fck/file/dexatonakelamilu.pdfIn PDF document text
- https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/urikdgonf6jvsdvr8c8daolq06/45085946626.pdfIn PDF document text
- https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/35675ee160d3e83a996f1f0f7cc19e9b/34732821602.pdfIn PDF document text
- http://xn--365-pn7mwb654m2qn.com/ckupload/files/xexibitep.pdfIn PDF document text
- https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/6efe91cba3f3903acb90d537ba307822/zupemufafibapugasar.pdfIn PDF document text
- http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac41ed5dca5---3607788960.pdfIn PDF document text
- https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a92385eaf86---42102770143.pdfIn PDF document text
- http://adams-gold.ru/archive/image/file/lelonizitewezifidiro.pdfIn PDF document text
- http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9e2b3913d---vowojixij.pdfIn PDF document text
- https://robert-zauer.cz/userfiles/file/ritijonuwiko.pdfIn PDF document text
- https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/607eabd73dab17091ec8cfa90e57fe96/95881930247.pdfIn PDF document text
- https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/viajb9t03r7rsfv0a0cic577s5/musujapufi.pdfIn PDF document text
- http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e5927ef80---81155762732.pdfIn PDF document text
- https://soechi.com/userfiles/file/12866130077.pdfIn PDF document text
- https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/af27f49a1aa1c38c086992d21bedefe2/puxivirojewuzufulotepak.pdfIn PDF document text
- https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/ab5822c2a55717322c067046c918e2d8/22856506903.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_off0000dcd9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDCD9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f4f0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF4F0	11248 bytes
SHA-256: `9e32c681fb9a188c6b7b8b699ad46f6cdb8d0cc75aebaa8b81ca4757b1b753d4`
`font_02_sfnt_off00010ef8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10EF8	16880 bytes
SHA-256: `ea7eab9fafeb4cc9121d1523fcea4efc3999f76ba606d5e2c9b4f3401685b02b`

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