PDF malware analysis — malicious · 0918eb231173f552

MALICIOUS

PDF

78.6 KB Created: 2021-09-07 22:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 61d9a65fc64fbed99f9762c4eb2639be SHA-1: f8330d2ef0b5ac99ad3863eea7cf537ffe2ebc80 SHA-256: 0918eb231173f552c876cc06ac779010e3fe7c598efd6ee5955aca626a34b7d5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farms points towards a phishing or malware distribution scheme.

Machine Learning

Nyx PDF Classifier malicious score 0.9911

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 http://parquessolaresdenavarra.com/userfiles/files/54272930032.pdf In PDF document text
- https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080b9645f063---zewujikerolomosuzi.pdfIn PDF document text
- https://spacio.hk/attachment/file/wivup.pdfIn PDF document text
- http://essuances.com/ckfinder/userfiles/files/wojafavovanepexagibu.pdfIn PDF document text
- http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/be456bac1aef216a03dac412699bcc7d/25826748689.pdfIn PDF document text
- https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/b509f492c44ecf77c4aa48da938074e4/sirisit.pdfIn PDF document text
- https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792d1baefd7---54892093352.pdfIn PDF document text
- https://kop-trans.pl/uploads/userfiles/files/31249450659.pdfIn PDF document text
- http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779472e68c3---36760423321.pdfIn PDF document text
- https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd2df9d86e---zivomatajarepudekidi.pdfIn PDF document text
- http://arniestribu.com/campannas/file/nidudetopamegafitenoverep.pdfIn PDF document text
- http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/b8db3c7caf9cf1b718114eff274c9918/meximatenamefuraxiwuzu.pdfIn PDF document text
- https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/tunidojewejezade.pdfIn PDF document text
- http://royalwedding.jp/images/blog//file/68355792438.pdfIn PDF document text
- http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160acf25d0e910---2045957684.pdfIn PDF document text
- https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/m3ipho1nqmk4lvs8tvmt8qq5pj/rezefavokelaxiruzopo.pdfIn PDF document text
- http://diamant-x.sk/UserFiles/file/takijajo.pdfIn PDF document text
- http://massimosusto.eu/userfiles/files/zudiruti.pdfIn PDF document text
- https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/8d01254802d89beb2d723dac56e5502f/venoxoke.pdfIn PDF document text
- http://minipit.com/data/files/80455396200.pdfIn PDF document text
- https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088045bdd8ba---34616172892.pdfIn PDF document text
- http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d370bcdf38---silasemibujimew.pdfIn PDF document text
- https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/99ad6ef03f120e0fa894264da60397b0/xebasujosufa.pdfIn PDF document text
- http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916654388f9---18150680724.pdfIn PDF document text
- http://landia-print.com/pdir/file/fofudipofi.pdfIn PDF document text
- https://monyetmesum.com/contents/files/87301337078.pdfIn PDF document text
- https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608aff33e019b---93146176351.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=spiral+bevel+gear+calculation+formula+pdfPDF link annotation
- 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_off0000cd4c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCD4C	17352 bytes
SHA-256: `db13fd8fbb9082abf5c63031a9844f3efb777ecfe67c2ad5f71533e2b3054d1d`
`font_01_sfnt_off0000fa04.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA04	11176 bytes
SHA-256: `9a431862cbfe7ed26218c2a90a7b48c9b9ac4f61e93b550c7e0bba5fd14dd3b3`
`font_02_sfnt_off000113be.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x113BE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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